SDL_RWops bug fixes and enhancements

[Antonio_SJ_Musumeci]

http://www.landofbile.com/software/sdl_rwops.tar.gz

Changelog included in tar.gz

[Antonio_Musumeci]

http://www.landofbile.com/software/sdl_rwops.tar.gz

specifics in change file

Also… is this the correct place to submit patchs? there is no sdl
developer list afaik.