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/upstart.tmpl

@@ -1,7 +1,7 @@
 # Template file for 'upstart'
 pkgname=upstart
 version=0.5.0
-distfiles="http://upstart.ubuntu.com/download/0.5/$pkgname-$version@.tar.bz2"
+distfiles="http://upstart.ubuntu.com/download/0.5/$pkgname-$version.tar.bz2"
 build_style=gnu_configure
 configure_args="--disable-rpath --exec-prefix=/ --enable-threading"
 make_install_args="sbindir=$XBPS_DESTDIR/$pkgname-$version/sbin"