Remove SDL 1 build components.
Remove unused SDL patches.
Update license for SDL patches, to reflect change in license of SDL 2.
Rename 'sdl2' to 'sdl' in buildsystem files.
Add script for generating patch files from local repositories.
Standardise patch names for Pygame.
Experimental Retina display support for text rendering.
Standardise patch names for Ren'Py.
Standardise patch names for SDL.
Fix libtool error when compiling libjpeg-turbo.
Fix 'C compiler cannot create executables' error compiling Python.