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drisw: frequent intermittent failures in glx-multithread-shader-compile

Regression since 52426ce4 ("drisw: Try harder to probe whether MIT-SHM works") under:

GALLIUM_DRIVER=softpipe LIBGL_ALWAYS_SOFTWARE=1 glx-multithread-shader-compile -auto

The two threads race to do the check_xshm detection and the one that loses fails to catch the error. Perhaps we need to use xcb instaed?

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