Add ma_offset_pcm_frames_{const_}ptr_f32.

This also silences a warning on GCC.

miniaudio.h

@@ -5675,6 +5675,8 @@ Offsets a pointer by the specified number of PCM frames.
 */
 MA_API void* ma_offset_pcm_frames_ptr(void* p, ma_uint64 offsetInFrames, ma_format format, ma_uint32 channels);
 MA_API const void* ma_offset_pcm_frames_const_ptr(const void* p, ma_uint64 offsetInFrames, ma_format format, ma_uint32 channels);
+static MA_INLINE float* ma_offset_pcm_frames_ptr_f32(float* p, ma_uint64 offsetInFrames, ma_uint32 channels) { return (float*)ma_offset_pcm_frames_const_ptr((void*)p, offsetInFrames, ma_format_f32, channels); }
+static MA_INLINE const float* ma_offset_pcm_frames_const_ptr_f32(const float* p, ma_uint64 offsetInFrames, ma_uint32 channels) { return (const float*)ma_offset_pcm_frames_const_ptr((const void*)p, offsetInFrames, ma_format_f32, channels); }
 
 
 /*
@@ -11118,7 +11120,7 @@ Timing
 
 *******************************************************************************/
 #ifdef MA_WIN32
-    static LARGE_INTEGER g_ma_TimerFrequency = {{0}};
+    static LARGE_INTEGER g_ma_TimerFrequency;   /* <-- Initialized to zero since it's static. */
     static void ma_timer_init(ma_timer* pTimer)
     {
         LARGE_INTEGER counter;