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/hicolor-icon-theme.tmpl

@@ -2,7 +2,7 @@
 pkgname=hicolor-icon-theme
 version=0.10
 distfiles="
-http://icon-theme.freedesktop.org/releases/$pkgname-$version@.tar.gz"
+http://icon-theme.freedesktop.org/releases/$pkgname-$version.tar.gz"
 build_style=gnu_configure
 make_cmd="$XBPS_MASTERDIR/bin/gmake"
 short_desc="Standard icon theme called hicolor"