use ansi c declarations

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15435 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/telnet.m4

@@ -35,7 +35,7 @@ case "$host" in
 			#include <stdio.h>
 			#include <errno.h>
 
-			int main()
+			int main(int argc, char **argv)
 			{
 			  int ret;
 			  ret = getmsg(open("/dev/null", 0), NULL, NULL, NULL);