Platform: add a cplusplus requirement to XAudio

compnerd · compnerd · commit 715d81cf269b · 2021-01-05T14:47:02.000-08:00
In some cases when building the `XAudio` module, we would end up going
down C++ paths:

```
C:\Program Files (x86)\Windows Kits\10\/Include/10.0.17763.0/um/xaudio2.h:61:26: error: 'uuid' attribute is not supported in C
    interface __declspec(uuid("2B02E3CF-2E0B-4ec3-BE45-1B2A3FE7210D")) IXAudio2;
                             ^
&lt;module-includes&gt;:29:10: note: in file included from &lt;module-includes&gt;:29:
         ^
```

Although this works with newer SDKs, it does not work with older SDKs.
Filter out the module for the time being with a requirement on `C++`.
This should be possible to use with `-enable-cxx-interop`.
diff --git a/stdlib/public/Platform/winsdk.modulemap b/stdlib/public/Platform/winsdk.modulemap
@@ -168,6 +168,8 @@ module WinSDK [system] {
       export *
 
       link "xaudio2.lib"
+
+      requires cplusplus
     }
 
     // XInput 1.4 (Windows 10, XBox) is newer than the XInput 9.1.0 which was

Original file line number	Diff line number	Diff line change
`@@ -168,6 +168,8 @@ module WinSDK [system] {`
`168`	`168`	`export *`
`169`	`169`
`170`	`170`	`link "xaudio2.lib"`
	`171`	`+`
	`172`	`+ requires cplusplus`
`171`	`173`	`}`
`172`	`174`
`173`	`175`	`// XInput 1.4 (Windows 10, XBox) is newer than the XInput 9.1.0 which was`