Get DirectSound and WinMM backends compiling with Cosmopolitan.

Note that this does not currently work at runtime.

extras/cosmopolitan/include/windows.h

@@ -14,10 +14,13 @@ eliminate all of the content in this file.
 
 #define WINAPI
 #define STDMETHODCALLTYPE
+#define CALLBACK
 
 typedef uint64_t                    HWND;
 typedef uint64_t                    HANDLE;
 typedef uint64_t                    HKEY;
+typedef uint64_t                    HWAVEIN;
+typedef uint64_t                    HWAVEOUT;
 typedef uint32_t                    HRESULT;
 typedef uint8_t                     BYTE;
 typedef uint16_t                    WORD;
@@ -30,6 +33,9 @@ typedef uint32_t                    ULONG;  /* `long` is always 32-bit on Window
 typedef uint64_t                    ULONGLONG;
 typedef char16_t                    WCHAR;
 typedef unsigned int                UINT;
+typedef char                        CHAR;
+typedef uint64_t                    ULONG_PTR;  /* Everything is 64-bit with Cosmopolitan. */
+typedef ULONG_PTR                   DWORD_PTR;
 
 #define TRUE                        1
 #define FALSE                       0
@@ -80,6 +86,72 @@ typedef struct
 
 typedef int64_t LARGE_INTEGER;
 
+
+
+#define HKEY_LOCAL_MACHINE      ((HKEY)(ULONG_PTR)(0x80000002))
+#define KEY_READ                0x00020019
+
+
+#define MMSYSERR_NOERROR        0
+#define MMSYSERR_ERROR          1
+#define MMSYSERR_BADDEVICEID    2
+#define MMSYSERR_INVALHANDLE    5
+#define MMSYSERR_NOMEM          7
+#define MMSYSERR_INVALFLAG      10
+#define MMSYSERR_INVALPARAM     11
+#define MMSYSERR_HANDLEBUSY     12
+
+#define CALLBACK_EVENT          0x00050000
+#define WAVE_ALLOWSYNC          0x0002
+
+#define WHDR_DONE               0x00000001
+#define WHDR_PREPARED           0x00000002
+#define WHDR_BEGINLOOP          0x00000004
+#define WHDR_ENDLOOP            0x00000008
+#define WHDR_INQUEUE            0x00000010
+
+#define MAXPNAMELEN             32
+
+typedef UINT                    MMRESULT;
+typedef UINT                    MMVERSION;
+
+typedef struct
+{
+    WORD wMid;
+    WORD wPid;
+    MMVERSION vDriverVersion;
+    CHAR szPname[MAXPNAMELEN];
+    DWORD dwFormats;
+    WORD wChannels;
+    WORD wReserved1;
+} WAVEINCAPSA;
+
+typedef struct
+{
+    WORD wMid;
+    WORD wPid;
+    MMVERSION vDriverVersion;
+    CHAR szPname[MAXPNAMELEN];
+    DWORD dwFormats;
+    WORD wChannels;
+    WORD wReserved1;
+    DWORD dwSupport;
+} WAVEOUTCAPSA;
+
+typedef struct tagWAVEHDR
+{
+    char* lpData;
+    DWORD dwBufferLength;
+    DWORD dwBytesRecorded;
+    DWORD_PTR dwUser;
+    DWORD dwFlags;
+    DWORD dwLoops;
+    struct tagWAVEHDR* lpNext;
+    DWORD_PTR reserved;
+} WAVEHDR;
+
+
+
 static HANDLE CreateEventA(struct NtSecurityAttributes* lpEventAttributes, bool32 bManualReset, bool32 bInitialState, const char* lpName)
 {
     assert(lpName == NULL);  /* If this is ever triggered we'll need to do a ANSI-to-Unicode conversion. */