xgl:  Remove XGL_* typedef wrappers

Part of moving to xgl.h rev#38, svn rev 29293-29302
diff --git a/tests/xgltestbinding.h b/tests/xgltestbinding.h
index e8cd76a..a47b44a 100644
--- a/tests/xgltestbinding.h
+++ b/tests/xgltestbinding.h
@@ -623,7 +623,7 @@
     XGL_MEMORY_ALLOC_INFO info = {};
     info.sType = XGL_STRUCTURE_TYPE_MEMORY_ALLOC_INFO;
     if (next_info != NULL)
-        info.pNext = (XGL_VOID *) next_info;
+        info.pNext = (void *) next_info;
 
     info.allocationSize = reqs.size;
     info.memProps = reqs.memProps;