Use standard conforming main() definition

w3mhelperpanel.c

@@ -164,7 +164,7 @@ editMailcap(char *mailcap, struct parsed_tagarg *args)
 }
 
 int
-main(int argc, char *argv[], char **envp)
+main(int argc, char *argv[])
 {
     Str mailcapfile;
     extern char *getenv();