Add X.Org vendor string to aliases for virtual bindings.

--- motif-2.3.8-orig/bindings/xmbind.alias
+++ motif-2.3.8/bindings/xmbind.alias
@@ -62,3 +62,4 @@
 "Sun Microsystems, Inc."				sun
 ! "Sun Microsystems, Inc."				sun_at
 "Tektronix, Inc."					tek
+"The X.Org Foundation"					pc