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/e2fsprogs.tmpl

@@ -2,7 +2,7 @@
 pkgname=e2fsprogs
 version=1.41.3
 distfiles="
-http://prdownloads.sourceforge.net/e2fsprogs/$pkgname-$version@.tar.gz"
+http://prdownloads.sourceforge.net/e2fsprogs/$pkgname-$version.tar.gz"
 build_style=gnu_configure
 configure_args="--enable-compression --enable-htree --enable-elf-shlibs
  --enable-fsck --enable-e2initrd-helper --disable-rpath --bindir=/bin