[rcore] Small issues on MacOS with SDL2

[atticus5]

Issue description

When building raylib with SDL2 as backend I faced 2 issues:

1. The InitPlatform() method calls SDL_Init(SDL_INIT_EVERYTHING) which results in some SDL2 fatal exceptions, which I cannot reproduce now, but I found that SDL_Init(SDL_INIT_VIDEO) works fine. I found something on the internet that the SDL_INIT_AUDIO is the issue, a subsystem which is included by SDL_INIT_EVERYTHING, but not actually needed for raylib.
2. Another error I caught was Failed creating OpenGL context at version requested because on Apple if you are using OpenGL 3.3 the SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE) is not called, even though for OpenGL 4.3 it is.
3. There is no automatic way of building with SDL2? The PLATFORM variable only supports Desktop which defaults to GLFW.

Environment

MacOS Sonoma 14.1.1 M1, OpenGL 3.3

[atticus5]

2. Is certainly a bug, in GLFW implementation, rcore_desktop.c, the call is not missing.

[raysan5]

@atticus5 Thanks for reporting! It has been reviewed 1. and 2. but about 3., Makefile supports PLATFORM=PLATFORM_DESKTOP_SDL.

[atticus5]

@raysan5 thank you, but I'm using CMake and GLFW is hardcoded:

https://github.com/raysan5/raylib/blob/7ec43022c177cbf00b27c9e9ab067bd6889957a4/cmake/LibraryConfigurations.cmake#L11

[raysan5]

@atticus5 Oh, I'm afraid I'm not the user neither maintainer of CMake build system. It was contributed by the community and I kept it for convenience but any expert on CMake should review and maintain it.