Replace usage of DamageRegionAppend with DamageDamageRegion to fix reportAfter.

In all these cases, any rendering implied by this damage has already
occurred, and we want to get the damage out to the client.  Some of
the DamageRegionAppend calls were explicitly telling damage to flush
the reportAfter damage out, but not all.

Bug #30260. Fixes the compiz wallpaper plugin with client damage
changed to reportAfter.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

glx/glxdri.c

@@ -834,9 +834,7 @@ static void __glXReportDamage(__DRIdrawable *driDraw,
 
     RegionInit(&region, (BoxPtr) rects, num_rects);
     RegionTranslate(&region, pDraw->x, pDraw->y);
-    DamageRegionAppend(pDraw, &region);
-    /* This is wrong, this needs a seperate function. */
-    DamageRegionProcessPending(pDraw);
+    DamageDamageRegion(pDraw, &region);
     RegionUninit(&region);
 
     __glXleaveServer(GL_FALSE);