xwayland: Fix build warning without glamor
Building Xwayland without glamor support would raise a warning at build time:
xwayland.c: In function ‘xwl_screen_init’: xwayland.c:980:10: warning: unused variable ‘use_eglstreams’ 980 | Bool use_eglstreams = FALSE; | ^~~~~~~~~~~~~~
When building without glamor support, we cannot have EGL Streams support
either, the two being related. So we do not need to declare the variable
use_eglstreams
if glamor is not enabled.
Signed-off-by: Olivier Fourdan ofourdan@redhat.com