macOS status update

Created by: fxcoudert

With all the recent pull requests merged, I can now run make GCCVER=12 GTKV=4 atomes natively on macOS, with Gtk+4 and GCC installed through Homebrew, and it compiles directly.

However, there is an OpenGL issue. I can view a structure, rotate it, but there is a color or lighting issue:

I can pick atoms and they get a cyan color, so I think the issue is not color, but lighting or shading.

Also, colors are OK in wireframe mode: