Adjusted patches for sdlmixer and sdl_image and gigalomania

Created by: fabiao

I relaunched diff -u for sdl_image and sdl_mixer, I hope the line endings of gigalomania recipe are ok. I adjusted gigalomania game.cpp patch, now should work correctly I rechecked all patches reducing code modifications in some cases. After cleaning recipe and cooking manually all stages I have no issues, I have pop_os 18.04 and did modification with vscode that usually maintains encoding and line ending from source. If you have issues could you send me rejected files, please?