glx: Use __glX_send_client_info with XCB

__glX_send_client_info only supports XCB, so use that instead of
__glXClientInfo when USE_XCB is defined.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>

src/glx/glxext.c

@@ -887,7 +887,11 @@ __glXInitialize(Display * dpy)
       return NULL;
    }
 
+#ifdef USE_XCB
+   __glX_send_client_info(dpyPriv);
+#else
    __glXClientInfo(dpy, dpyPriv->majorOpcode);
+#endif
 
    /* Grab the lock again and add the dispay private, unless somebody
     * beat us to initializing on this display in the meantime. */