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/ntp/perl.template

@@ -10,11 +10,8 @@ Add_dependency run perl
 
 do_install()
 {
-	local destdir=${XBPS_DESTDIR}/${pkgname}-${version}
-	local origdir=${XBPS_DESTDIR}/${sourcepkg}-${version}
-
-	mkdir -p ${destdir}/usr/bin
+	mkdir -p ${DESTDIR}/usr/bin
 	for f in ntp-wait ntptrace; do
-		mv ${origdir}/usr/bin/${f} ${destdir}/usr/bin
+		mv ${SRCPKGDESTDIR}/usr/bin/${f} ${DESTDIR}/usr/bin
 	done
 }