Merge remote-tracking branch 'upstream/master'
OpenGL: FOF cutting fix

Fixes any FOF's with FF_SOLID not cutting each other.
Merge remote-tracking branch 'upstream/master'
OpenGL: FOF Cutting Fix 2

Fixes Translucent FOF's cutting Solid FOF's.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'Sryder13/master'
Merge branch 'master' into sdl2
Switch the Linux symbolic links with manual copy-pastes, should fix compiling on Windows for most users.
Merge remote-tracking branch 'origin/master' into sdl2
DIE, DIE, DIE
DIE, DIE, DIE
come back to life
Merge branch 'master' into sdl2
sdl2: joystick fixes. don't pause in demo play/rec
sdl2: truncate resolution list, add 16:9 hdtv modes
sdl2: reuse window on mode change
sdl2: start getting opengl working again
sdl2: we have colored rects in gl now I guess
sdl2: fix opengl (almost) entirely
sdl2: opengl compiles fine, no TESTHW=1 needed