winrt: Removed WinRT/Windows Phone/UWP support.

Fixes #10724.

include/SDL3/SDL_system.h

@@ -559,90 +559,6 @@ extern SDL_DECLSPEC SDL_bool SDLCALL SDL_SendAndroidMessage(Uint32 command, int
 
 #endif /* SDL_PLATFORM_ANDROID */
 
-/*
- * Platform specific functions for WinRT
- */
-#ifdef SDL_PLATFORM_WINRT
-
-/**
- * WinRT / Windows Phone path types
- *
- * \since This enum is available since SDL 3.0.0.
- */
-typedef enum SDL_WinRT_Path
-{
-    /** The installed app's root directory.
-        Files here are likely to be read-only. */
-    SDL_WINRT_PATH_INSTALLED_LOCATION,
-
-    /** The app's local data store.  Files may be written here */
-    SDL_WINRT_PATH_LOCAL_FOLDER,
-
-    /** The app's roaming data store.  Unsupported on Windows Phone.
-        Files written here may be copied to other machines via a network
-        connection.
-    */
-    SDL_WINRT_PATH_ROAMING_FOLDER,
-
-    /** The app's temporary data store.  Unsupported on Windows Phone.
-        Files written here may be deleted at any time. */
-    SDL_WINRT_PATH_TEMP_FOLDER
-} SDL_WinRT_Path;
-
-
-/**
- * WinRT Device Family
- *
- * \since This enum is available since SDL 3.0.0.
- */
-typedef enum SDL_WinRT_DeviceFamily
-{
-    /** Unknown family  */
-    SDL_WINRT_DEVICEFAMILY_UNKNOWN,
-
-    /** Desktop family*/
-    SDL_WINRT_DEVICEFAMILY_DESKTOP,
-
-    /** Mobile family (for example smartphone) */
-    SDL_WINRT_DEVICEFAMILY_MOBILE,
-
-    /** XBox family */
-    SDL_WINRT_DEVICEFAMILY_XBOX,
-} SDL_WinRT_DeviceFamily;
-
-
-/**
- * Retrieve a WinRT defined path on the local file system.
- *
- * Not all paths are available on all versions of Windows. This is especially
- * true on Windows Phone. Check the documentation for the given SDL_WinRT_Path
- * for more information on which path types are supported where.
- *
- * Documentation on most app-specific path types on WinRT can be found on
- * MSDN, at the URL:
- *
- * https://msdn.microsoft.com/en-us/library/windows/apps/hh464917.aspx
- *
- * \param pathType the type of path to retrieve, one of SDL_WinRT_Path.
- * \returns a UTF-8 string (8-bit, multi-byte) containing the path, or NULL if
- *          the path is not available for any reason; call SDL_GetError() for
- *          more information.
- *
- * \since This function is available since SDL 3.0.0.
- */
-extern SDL_DECLSPEC const char * SDLCALL SDL_GetWinRTFSPath(SDL_WinRT_Path pathType);
-
-/**
- * Detects the device family of WinRT platform at runtime.
- *
- * \returns a value from the SDL_WinRT_DeviceFamily enum.
- *
- * \since This function is available since SDL 3.0.0.
- */
-extern SDL_DECLSPEC SDL_WinRT_DeviceFamily SDLCALL SDL_GetWinRTDeviceFamily();
-
-#endif /* SDL_PLATFORM_WINRT */
-
 /**
  * Query if the current device is a tablet.
  *