Add required CONFIG conditions to pro file

The module will be skipped if the conditions are not met.

Change-Id: I99593777348bd8c74e8c32f0a4ff482bbaa8812d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

qtwayland.pro

+requires(linux:!android)
+
 load(configure)
 qtCompileTest(wayland)
 qtCompileTest(xkbcommon)