/usr/libexec should not be put into the PATH

rely on the PATH set up in the root crontab(5), just like in monthly(8)
suggested by ajacoutot@; "i like this" okan@; feedback jmc@ sthen@;
"absolutely" deraadt@

src/etc/weekly

@@ -1,11 +1,8 @@
 #
-#	$OpenBSD: weekly,v 1.21 2009/05/10 19:27:25 schwarze Exp $
+#	$OpenBSD: weekly,v 1.22 2009/05/18 19:57:56 schwarze Exp $
 #
 umask 022
 
-PATH=/bin:/sbin:/usr/sbin:/usr/bin:/usr/libexec
-export PATH
-
 PARTOUT=/var/log/weekly.part
 MAINOUT=/var/log/weekly.out
 install -o 0 -g 0 -m 600    /dev/null $PARTOUT
@@ -64,7 +61,7 @@ if [ -f /var/db/locate.database ]; then
 fi
 
 next_part "Rebuilding whatis databases:"
-makewhatis
+/usr/libexec/makewhatis
 
 # If LOGINACCOUNTING is set to 1 in the environment, report user
 # accounting information