hw/xwayland/Makefile.am: fix build without glx

Merged Fabrice Fontaine requested to merge (removed):master into master

Commit d8ec33fe added libglxvnd.la to Xwayland_LDFLAGS but GLX can be disabled through --disable-glx. In this case, build fails on:

make[3]: *** No rule to make target '../../glx/libglxvnd.la', needed by 'Xwayland'. Stop. make[3]: *** Waiting for unfinished jobs....


Signed-off-by: Fabrice Fontaine fontaine.fabrice@gmail.com

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