wasapi: suppress warnings

Suppress warnings for missing braces:

    src/audio/capture/wasapi.cpp:61:41: warning: suggest braces around initialization of subobject [-Wmissing-braces]
       61 | const GUID KSDATAFORMAT_SUBTYPE_PCM = { STATIC_KSDATAFORMAT_SUBTYPE_PCM };

The macro is actually defined with Mingw-w64.

src/audio/capture/wasapi.cpp

@@ -58,8 +58,11 @@
 const IID IID_IAudioCaptureClient = __uuidof(IAudioCaptureClient);
 const static GUID IDevice_FriendlyName = { 0xa45c254e, 0xdf1c, 0x4efd, { 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0 } };
 const static PROPERTYKEY PKEY_Device_FriendlyName = { IDevice_FriendlyName, 14 };
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-braces" // not our issue - defined by Mingw-w64
 const GUID KSDATAFORMAT_SUBTYPE_PCM = { STATIC_KSDATAFORMAT_SUBTYPE_PCM };
 const GUID KSDATAFORMAT_SUBTYPE_IEEE_FLOAT = { STATIC_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT };
+#pragma GCC diagnostic pop
 
 using std::cout;
 using std::ostringstream;

src/audio/playback/wasapi.cpp

@@ -61,7 +61,10 @@ const IID IID_IAudioClient = __uuidof(IAudioClient);
 const IID IID_IAudioRenderClient = __uuidof(IAudioRenderClient);
 const static GUID IDevice_FriendlyName = { 0xa45c254e, 0xdf1c, 0x4efd, { 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0 } };
 const static PROPERTYKEY PKEY_Device_FriendlyName = { IDevice_FriendlyName, 14 };
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-braces" // not our issue - defined by Mingw-w64
 const static GUID UG_KSDATAFORMAT_SUBTYPE_PCM = { STATIC_KSDATAFORMAT_SUBTYPE_PCM };
+#pragma GCC diagnostic pop
 
 
 using std::cout;