modesetting: don't try and load dri2

Since we are shipped with the server and the server has it built-in,
don't bother trying to load it.

Don't remove or invert the if statement on purpose as a later
patch adds stuff in here.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

hw/xfree86/drivers/modesetting/driver.c

@@ -820,7 +820,6 @@ PreInit(ScrnInfoPtr pScrn, int flags)
     try_enable_glamor(pScrn);
 
     if (ms->drmmode.glamor) {
-        xf86LoadSubModule(pScrn, "dri2");
     } else {
         Bool prefer_shadow = TRUE;