Use bash features to improve $distfiles parsing.

That means that it's not necessary anymore to use an '@' before the
extract suffix string. yay.

--HG--
extra : convert_revision : 83ce2c783cb917ef59b87eacb0565cfcff277218

templates/intltool.tmpl

@@ -2,7 +2,7 @@
 pkgname=intltool
 version=0.40.4
 distfiles="
-http://ftp.gnome.org/pub/GNOME/sources/intltool/0.40/$pkgname-$version@.tar.bz2"
+http://ftp.gnome.org/pub/GNOME/sources/intltool/0.40/$pkgname-$version.tar.bz2"
 build_style=gnu_configure
 make_cmd="$XBPS_MASTERDIR/bin/gmake"
 short_desc="Toolbox for internationalisation"