Features of DRI 2.2 and above are broken in an xcb-less system.
They cause crashes (intel) or X to fully use one core (radeon),
and no rendering in either case.

Since we're still avoiding xcb for this cycle, claim only DRI 2.1.

diff --git a/hw/xfree86/dri2/dri2.c b/hw/xfree86/dri2/dri2.c
index af3bcae..b3242c3 100644
--- a/hw/xfree86/dri2/dri2.c
+++ b/hw/xfree86/dri2/dri2.c
@@ -1115,19 +1115,19 @@ DRI2ScreenInit(ScreenPtr pScreen, DRI2InfoPtr info)
     ds->DestroyBuffer  = info->DestroyBuffer;
     ds->CopyRegion     = info->CopyRegion;
 
-    if (info->version >= 4) {
+/*    if (info->version >= 4) {
 	ds->ScheduleSwap = info->ScheduleSwap;
 	ds->ScheduleWaitMSC = info->ScheduleWaitMSC;
 	ds->GetMSC = info->GetMSC;
 	cur_minor = 3;
-    } else {
+    } else {*/
 	cur_minor = 1;
-    }
+/*    }
 
     if (info->version >= 5) {
         ds->AuthMagic = info->AuthMagic;
     }
-
+*/
     /*
      * if the driver doesn't provide an AuthMagic function or the info struct
      * version is too low, it relies on the old method (using libdrm) or fail