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/gkrellm.tmpl

@@ -3,7 +3,7 @@ pkgname=gkrellm
 version=2.3.2
 patch_files="$pkgname-fix-sensors.diff"
 distfiles="
-http://members.dslextreme.com/users/billw/gkrellm/$pkgname-$version@.tar.bz2"
+http://members.dslextreme.com/users/billw/gkrellm/$pkgname-$version.tar.bz2"
 build_style=gnu_makefile
 make_cmd="$XBPS_MASTERDIR/bin/gmake"
 make_build_target="netbsd2"