check for tpcshrd.h and define HAVE_TPCSHRD_H if it's available.

include/SDL_config.h.cmake

@@ -251,6 +251,7 @@
 
 #cmakedefine HAVE_MMDEVICEAPI_H @HAVE_MMDEVICEAPI_H@
 #cmakedefine HAVE_AUDIOCLIENT_H @HAVE_AUDIOCLIENT_H@
+#cmakedefine HAVE_TPCSHRD_H @HAVE_TPCSHRD_H@
 #cmakedefine HAVE_SENSORSAPI_H @HAVE_SENSORSAPI_H@
 
 #cmakedefine HAVE_XINPUT_GAMEPAD_EX @HAVE_XINPUT_GAMEPAD_EX@

include/SDL_config.h.in

@@ -240,6 +240,7 @@
 
 #undef HAVE_MMDEVICEAPI_H
 #undef HAVE_AUDIOCLIENT_H
+#undef HAVE_TPCSHRD_H
 #undef HAVE_SENSORSAPI_H
 
 /* SDL internal assertion support */

include/SDL_config_windows.h

@@ -103,6 +103,7 @@ typedef unsigned int uintptr_t;
 #endif
 #define HAVE_MMDEVICEAPI_H 1
 #define HAVE_AUDIOCLIENT_H 1
+#define HAVE_TPCSHRD_H 1
 #define HAVE_SENSORSAPI_H 1
 #if (defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64)) && (defined(_MSC_VER) && _MSC_VER >= 1600)
 #define HAVE_IMMINTRIN_H 1

include/SDL_config_winrt.h

@@ -100,6 +100,7 @@ typedef unsigned int uintptr_t;
 
 #define HAVE_MMDEVICEAPI_H 1
 #define HAVE_AUDIOCLIENT_H 1
+#define HAVE_TPCSHRD_H 1
 
 #define HAVE_LIBC 1
 #define STDC_HEADERS 1