When building Xwayland without glamor support enabled using automake,
the build would fail at link time trying to find `glamor_block_handler`:
/usr/bin/ld: xwayland-glx.o: in function `egl_drawable_wait_x':
hw/xwayland/xwayland-glx.c:102: undefined reference to
`glamor_block_handler'
Make sure we don't try to build `xwayland-glx.c` without glamor in the
Xwayland Makefile.
Note: Meson build is fine because it's already build only with glamor
enabled.
Fixes: commit 8469241 - "xwayland: Add EGL-backed GLX provider"
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
8587bbd85a