[3.0] SDL3 is not compiled with X11

[Perksey]

Our SDL3 native binaries aren't compiled with X11 and as a result only works with Wayland.

We should rectify this.

This is as evidenced by the following log lines in our builds:

-- Could NOT find X11 (missing: X11_X11_LIB) 
-- Could NOT find OpenGL (missing: OPENGL_opengl_LIBRARY OPENGL_glx_LIBRARY) 

Some reading online seems to indicate this might be the CMake version, but not completely sure.

This should be fixed before preview1 releases.