Android APK expansion main file version.
Defined in SDL_hints.h
#define SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION "SDL_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION"
Should be a string number like "1", "2" etc.
Must be set together with SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION.
If both hints were set then SDL_RWFromFile() will look into expansion files after a given relative path was not found in the internal storage and assets.
By default this hint is not set and the APK expansion files are not searched.