Renamed SDL_ttf.h to SDL2_ttf.h

[ellisvelo]

Hello,

I ran into a small problem when c2ffi is trying to execute because it is looking for SDL2_ttf.h referenced in sdl2-ttf.asd, but the file doesn't exist. This pull request renames SDL_ttf.h to SDL2_ttf.h so that c2ffi executes successfully. I wasn't sure if sdl2-ttf.asd should change or the header filename because some of the spec files start with SDL2 and others start with SDL. Thanks for looking into this.

[justjoheinz]

@ellisvelo I just ran into the same problem, wanted to make a PR and noticed that the maintainer did not do anything on github since 2020. I think it is time to fork these repositories. You already did an awesome job with the cl-sdl2 library and M1 architecture. Would you be willing to?

I also would like to get https://github.com/TatriX/cl-sdl2-tutorial running again and link the tutorial to the cl-sdl2 repo, so that more people are enabled to write graphical apps in Common Lisp.

[ellisvelo]

Thanks for the compliment @justjoheinz. 👍 I do have a fork of this repo (https://github.com/ellisvelo/cl-sdl2-ttf), but I think that I should make a PR for the Sharp Lispers and combine efforts: https://github.com/sharplispers/cl-sdl2-ttf

That's a good idea about the cl-sdl2-tutorial because I think the LazyFoo tutorials have changed too. Go for it!