Add prerequisite for KOI8-U.TXT

This was missed when the encoding was added.

Author: petere

src/backend/utils/mb/Unicode/Makefile

@@ -69,7 +69,7 @@ WINTEXTS = CP866.TXT CP874.TXT CP936.TXT CP949.TXT \
 	CP1256.TXT CP1257.TXT CP1258.TXT
 
 GENERICTEXTS = $(ISO8859TEXTS) $(WINTEXTS) \
-	KOI8-R.TXT JOHAB.TXT
+	KOI8-R.TXT KOI8-U.TXT JOHAB.TXT
 
 all: $(MAPS)