Tags: rswinkle/sdl_img

Windows cross-compile fixes

Forgot to remove this hardcoded transparency

Forgot to normalize a path

Remove unnecessary +

Update man page

Minor documentation updates

Update packaging script and man page

Update packaging

Remove local var loading

I decided that even if it saves a few cycles by not having to follow a
pointer, g is probably already in cache because it's accessed everywhere
so it's probably not a big deal and the mental overhead of having an extra
variable that has to be updated whenever the global g->loading is and isn't a
global itself is just too much/confusing for anyone just glancing at the
code, wanting to make a quick edit etc.

Finished updating stb_image.h

Had to redo the stbi_xload; based it on stbi__load_gif_main

This update fixes some broken gifs.