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/lcms.tmpl

@@ -1,7 +1,7 @@
 # Template build file for 'lcms'.
 pkgname=lcms
 version=1.17
-distfiles="http://www.littlecms.com/$pkgname-$version@.tar.gz"
+distfiles="http://www.littlecms.com/$pkgname-$version.tar.gz"
 build_style=gnu_configure
 pkgconfig_override="lcms.pc"
 short_desc="Light Color Management System -- a color management library"