Major changes to support multiple distfiles in templates.

Each template now needs to use $distfiles that accepts the full
URL to download the distfile and old $extract_sufx is now merged
on it, but this must be separated by the '@' character. Example:

distfiles="http://www.foo.org/blah-6.2@.tar.gz
http://www.foo.org/blob-1.0@.tar.bz2"

If distfiles contains multiple files defined, $wrksrc is now
mandatory.

--HG--
extra : convert_revision : 1c3fa35f148af8323ce3cbcf5732104960de6bc4

templates/jpeg.tmpl

@@ -3,9 +3,8 @@ pkgname=jpeg
 version=6.0b
 wrksrc=$pkgname-6b
 patch_files="$pkgname-makefile-cfg.diff"
-distfiles="jpegsrc.v6b"
-extract_sufx=".tar.gz"
-url=ftp://ftp.fu-berlin.de/unix/graphics/jpeg
+distfiles="
+ftp://ftp.fu-berlin.de/unix/graphics/jpeg/jpegsrc.v6b@.tar.gz"
 build_style=gnu_configure
 make_install_target="install install-lib"
 configure_args="--enable-shared --enable-static"