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

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