remove references to old lexicons

src/latin/ExtraLat.gf

@@ -1,5 +1,5 @@
 concrete ExtraLat of ExtraLatAbs =
-  CatLat, ExtraLexiconLat, ConjunctionLat ** 
+  CatLat, ConjunctionLat ** 
   open ResLat, ParadigmsLat, Coordination, Prelude in {
   lincat CS = Str ;
   lin

src/latin/ExtraLatAbs.gf

@@ -1,5 +1,5 @@
 abstract ExtraLatAbs =
-  Extra, ExtraLexiconLatAbs, Conjunction
+  Extra, Conjunction
   ** {
     cat CS ;
   fun