Provide some vars for use in template's targets.

These new vars are DESTDIR (by default XBPS_DESTDIR/pkgname-version),
SRCPKGDESTDIR (XBPS_DESTDIR/sourcepkg-version) and FILESDIR
(XBPS_TEMPLATESDIR/pkgname/files).

This simplifies packages that used them.

--HG--
extra : convert_revision : 287ea7128cb5df19870ca7aff0a3b8f99a11d63a

templates/sudo/template

@@ -22,10 +22,8 @@ Add_dependency full pam
 
 post_install()
 {
-	local destdir=$XBPS_DESTDIR/$pkgname-$version
-
-	install -d $destdir/etc/pam.d
-	cat > $destdir/etc/pam.d/sudo <<_EOF
+	install -d $DESTDIR/etc/pam.d
+	cat > $DESTDIR/etc/pam.d/sudo <<_EOF
 auth        required        pam_unix.so
 account     required        pam_unix.so
 session     optional        pam_mail.so     dir=/var/mail standard
@@ -33,4 +31,5 @@ session     optional	    pam_xauth.so
 session     required        pam_env.so
 session     required        pam_unix.so
 _EOF
+	chmod 644 $DESTDIR/etc/pam.d/sudo
 }