Removed SDL_AndroidOpenURL, added SDL_OpenURL.

Still needs to be wired into Xcode and Visual Studio projects.

include/SDL_system.h

@@ -206,13 +206,6 @@ extern DECLSPEC const char * SDLCALL SDL_AndroidGetExternalStoragePath(void);
  */
 extern DECLSPEC SDL_bool SDLCALL SDL_AndroidRequestPermission(const char *permission);
 
-/**
-   \brief Open an URL / URI in the browser or other
-
-   \return 0 on success, or -1 on error.
- */
-extern DECLSPEC int SDLCALL SDL_AndroidOpenURL(const char *url);
-
 #endif /* __ANDROID__ */
 
 /* Platform specific functions for WinRT */