Fix C++ compilation errors with the PulseAudio backend.

C++ does not allow implicit casts from void*, so add explict casts.

Issue: https://github.com/mackron/miniaudio/issues/215

miniaudio.h

@@ -21514,7 +21514,7 @@ static ma_result ma_context_enumerate_devices__pulse(ma_context* pContext, ma_en
 
     /* Playback. */
     if (!callbackData.isTerminated) {
-        pOP = ((ma_pa_context_get_sink_info_list_proc)pContext->pulse.pa_context_get_sink_info_list)(pContext->pulse.pPulseContext, ma_context_enumerate_devices_sink_callback__pulse, &callbackData);
+        pOP = ((ma_pa_context_get_sink_info_list_proc)pContext->pulse.pa_context_get_sink_info_list)((ma_pa_context*)(pContext->pulse.pPulseContext), ma_context_enumerate_devices_sink_callback__pulse, &callbackData);
         if (pOP == NULL) {
             result = MA_ERROR;
             goto done;
@@ -21530,7 +21530,7 @@ static ma_result ma_context_enumerate_devices__pulse(ma_context* pContext, ma_en
 
     /* Capture. */
     if (!callbackData.isTerminated) {
-        pOP = ((ma_pa_context_get_source_info_list_proc)pContext->pulse.pa_context_get_source_info_list)(pContext->pulse.pPulseContext, ma_context_enumerate_devices_source_callback__pulse, &callbackData);
+        pOP = ((ma_pa_context_get_source_info_list_proc)pContext->pulse.pa_context_get_source_info_list)((ma_pa_context*)(pContext->pulse.pPulseContext), ma_context_enumerate_devices_source_callback__pulse, &callbackData);
         if (pOP == NULL) {
             result = MA_ERROR;
             goto done;
@@ -21640,9 +21640,9 @@ static ma_result ma_context_get_device_info__pulse(ma_context* pContext, ma_devi
     result = ma_context_get_default_device_index__pulse(pContext, deviceType, &callbackData.defaultDeviceIndex);
 
     if (deviceType == ma_device_type_playback) {
-        pOP = ((ma_pa_context_get_sink_info_by_name_proc)pContext->pulse.pa_context_get_sink_info_by_name)(pContext->pulse.pPulseContext, pDeviceID->pulse, ma_context_get_device_info_sink_callback__pulse, &callbackData);
+        pOP = ((ma_pa_context_get_sink_info_by_name_proc)pContext->pulse.pa_context_get_sink_info_by_name)((ma_pa_context*)(pContext->pulse.pPulseContext), pDeviceID->pulse, ma_context_get_device_info_sink_callback__pulse, &callbackData);
     } else {
-        pOP = ((ma_pa_context_get_source_info_by_name_proc)pContext->pulse.pa_context_get_source_info_by_name)(pContext->pulse.pPulseContext, pDeviceID->pulse, ma_context_get_device_info_source_callback__pulse, &callbackData);
+        pOP = ((ma_pa_context_get_source_info_by_name_proc)pContext->pulse.pa_context_get_source_info_by_name)((ma_pa_context*)(pContext->pulse.pPulseContext), pDeviceID->pulse, ma_context_get_device_info_source_callback__pulse, &callbackData);
     }
 
     if (pOP != NULL) {
@@ -22192,7 +22192,7 @@ static ma_result ma_device_start__pulse(ma_device* pDevice)
         /* We need to fill some data before uncorking. Not doing this will result in the write callback never getting fired. */
         ma_mainloop_lock__pulse(pDevice->pContext, "ma_device_start__pulse");
         {
-            result = ma_device_write_to_stream__pulse(pDevice, pDevice->pulse.pStreamPlayback, NULL);
+            result = ma_device_write_to_stream__pulse(pDevice, (ma_pa_stream*)(pDevice->pulse.pStreamPlayback), NULL);
         }
         ma_mainloop_unlock__pulse(pDevice->pContext, "ma_device_start__pulse");
 
@@ -22479,7 +22479,7 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
     pContext->pulse.pPulseContext = ((ma_pa_context_new_proc)pContext->pulse.pa_context_new)(((ma_pa_threaded_mainloop_get_api_proc)pContext->pulse.pa_threaded_mainloop_get_api)((ma_pa_threaded_mainloop*)pContext->pulse.pMainLoop), pConfig->pulse.pApplicationName);
     if (pContext->pulse.pPulseContext == NULL) {
         result = ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to create PulseAudio context.", MA_FAILED_TO_INIT_BACKEND);
-        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)(pContext->pulse.pMainLoop);
+        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
     #endif
@@ -22490,7 +22490,7 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
     result = ma_result_from_pulse(((ma_pa_context_connect_proc)pContext->pulse.pa_context_connect)((ma_pa_context*)pContext->pulse.pPulseContext, pConfig->pulse.pServerName, (pConfig->pulse.tryAutoSpawn) ? 0 : MA_PA_CONTEXT_NOAUTOSPAWN, NULL));
     if (result != MA_SUCCESS) {
         ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to connect PulseAudio context.", result);
-        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)(pContext->pulse.pMainLoop);
+        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
     #endif
@@ -22502,7 +22502,7 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
     if (result != MA_SUCCESS) {
         ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to start mainloop.", result);
         ((ma_pa_context_unref_proc)pContext->pulse.pa_context_unref)((ma_pa_context*)pContext->pulse.pPulseContext);
-        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)(pContext->pulse.pMainLoop);
+        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
     #endif
@@ -22511,8 +22511,8 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
 
     result = ma_context_wait_for_pa_context_to_connect__pulse(pContext);
     if (result != MA_SUCCESS) {
-        ((ma_pa_threaded_mainloop_stop_proc)pContext->pulse.pa_threaded_mainloop_stop)(pContext->pulse.pMainLoop);
-        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)(pContext->pulse.pMainLoop);
+        ((ma_pa_threaded_mainloop_stop_proc)pContext->pulse.pa_threaded_mainloop_stop)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
+        ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
     #endif