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/net-tools/template

@@ -14,13 +14,11 @@ Add_dependency run glibc
 
 do_install()
 {
-	local destdir=$XBPS_DESTDIR/$pkgname-$version
-
 	cd $wrksrc
 	. $XBPS_HELPERSDIR/replace-interpreter.sh
 	replace_interpreter bash configure.sh
 
 	yes "" | make || exit 1
-	make BASEDIR=${destdir} update
-	rm -rf ${destdir}/usr/share/man/man1
+	make BASEDIR=${DESTDIR} update
+	rm -rf ${DESTDIR}/usr/share/man/man1
 }