meson: Remove config macros that are no longer used

All of the macros in question are not used in current xserver sources.

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
4 jobs for remove-unused-macros in 2 minutes and 39 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Docker Image
passed debian-buster #15788776

00:00:23

 
  Build And Test
passed meson #15788777

00:02:15

passed meson-noglamor #15788778

00:01:59

passed mingw-cross-build #15788779

00:00:55