added a missing path to SymbolUrd, previously causing an error message when compiling the rgl

src/urdu/SymbolUrd.gf

@@ -1,2 +1,4 @@
+--# -path=.:../hindustani:../abstract:../common
+
 concrete SymbolUrd of Symbol = CatUrd ** SymbolHindustani with
   (ResHindustani = ResUrd) ;