Use test(1) operators and test for the catpage not being older than the

manpage.

Identical mtimes (as generated by buildworld for these files) precluded
catpages from working.

Approved by:	gordon

usr.bin/man/man.sh

@@ -200,8 +200,8 @@ find_file() {
 # Usage: is_newer file1 file2
 # Returns true if file1 is newer than file2 as calculated by mtime.
 is_newer() {
-	if [ $(stat -f %m $1) -gt $(stat -f %m $2) ]; then
-		decho "    mtime: $1 newer than $2" 3
+	if ! [ "$1" -ot "$2" ]; then
+		decho "    mtime: $1 not older than $2" 3
 		return 0
 	else
 		decho "    mtime: $1 older than $2" 3