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/epdfview.tmpl

@@ -2,7 +2,7 @@
 pkgname=epdfview
 version=0.1.6
 distfiles="
-http://trac.emma-soft.com/epdfview/chrome/site/releases/$pkgname-$version@.tar.bz2"
+http://trac.emma-soft.com/epdfview/chrome/site/releases/$pkgname-$version.tar.bz2"
 build_style=gnu_configure
 ignore_files="charset.alias"
 short_desc="Lightweight PDF viewer using Poppler and GTK+"