Fixed platform define condition for Windows phone

Fixes https://github.com/libsdl-org/SDL/issues/11876

include/SDL3/SDL_platform_defines.h

@@ -366,7 +366,7 @@
  */
 #define SDL_WINAPI_FAMILY_PHONE (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
 
-#elif HAVE_WINAPIFAMILY_H && HAVE_WINAPIFAMILY_H
+#elif defined(HAVE_WINAPIFAMILY_H) && HAVE_WINAPIFAMILY_H
     #define SDL_WINAPI_FAMILY_PHONE (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
 #else
     #define SDL_WINAPI_FAMILY_PHONE 0