minor bugfix

Rev: lib/include/simulate.h:1.4

lib/include/simulate.h

 #define list multiset
 #define perror(X) werror(X)
 #define efun predef
-#define regexp(X,Y) filter((X),regexp(Y)->match)
+#define regexp(X,Y) filter((X),Regexp(Y)->match)
 import Simulate;