resource specialized to present tense ; preprocessor flag

lib/resource-1.0/english/CatEng.gf

@@ -37,6 +37,7 @@ concrete CatEng of Cat = CommonX ** open ResEng, Prelude in {
     VP = {
       s   : Tense => Anteriority => Polarity => Order => Agr => {fin, inf : Str} ;
       prp : Str ; -- present participle
+      inf : Str ; -- infinitive
       ad  : Str ;
       s2  : Agr => Str
       } ;