glx: fix xshm check to init xshm_opcode.
Found and proposed by Ray Strode (halfline)
Fixes: 68e89401 ("glx/drisw: use xcb instead of X to query connection")
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Found and proposed by Ray Strode (halfline)
Fixes: 68e89401 ("glx/drisw: use xcb instead of X to query connection")