[Development] Why is libxcb needed if GUI is disabled in build?

[Rutledge Shawn]

libX11 also ends up being linked into the eglfs platform plugin.  Even when configured with -no-xcb.  I must be missing something, otherwise how could any of the non-X11 embedded or Raspberry Pi stuff work…  Of course you can build on a machine that doesn't have the libs or headers available; I got that to work once.