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/perl-XML-Parser.tmpl

@@ -3,7 +3,7 @@ pkgname=perl-XML-Parser
 version=2.36
 wrksrc="XML-Parser-$version"
 distfiles="
-http://cpan.perl.org/modules/by-module/XML/XML-Parser-$version@.tar.gz"
+http://cpan.perl.org/modules/by-module/XML/XML-Parser-$version.tar.gz"
 build_style=perl_module
 make_build_args="EXPATLIBPATH=$XBPS_MASTERDIR/lib
  EXPATINCPATH=$XBPS_MASTERDIR/include"