glx: Assign unique serial number to GLXBadFBConfig error

Since commit f39fd3dce7 a new GLX error is issued in case context creation
fails. This broke wine on certain hardware: While wine installs an error handler
to ignore this kind of error, it does not function because it expects the
dpy->request serial number of the error to be incremented since the installation
of the handler.

Workaround this by artificially increasing the request number. This also
guarantees a unique serial number for the error.

Fixes: f39fd3dce7
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3969
Signed-off-by: Bastian Beranek <bastian.beischer@rwth-aachen.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10565>

src/glx/create_context.c

@@ -146,6 +146,9 @@ glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config,
        * somehow on the client side. clean up the server resource and panic.
        */
       xcb_glx_destroy_context(c, xid);
+      /* increment dpy->request in order to give a unique serial number to the
+       * error */
+      XNoOp(dpy);
       __glXSendError(dpy, GLXBadFBConfig, xid, 0, False);
    } else {
       gc->xid = xid;