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

helper-templates/unzip-extraction.sh

@@ -1,10 +1,20 @@
 #
 # This helper is used in templates using extract_sufx=".zip".
-# This checks if unzip is installed and installs it if it's not
-# and sets the unzip_cmd/extract_cmd variables appropiately.
+# This checks if unzip is installed and installs it if it's not.
 #
 # If unzip is already installed just return immediately.
 
+extract_unzip()
+{
+	local file="$1"
+	local dest="$2"
+
+	[ ! -f $file ] && exit 1
+
+	$XBPS_MASTERDIR/bin/unzip -q -x $file -d $dest
+	return $?
+}
+
 if [ ! -x "$XBPS_MASTERDIR/bin/unzip" ]; then
 	unzip_version="5.52"
 
@@ -13,7 +23,7 @@ if [ ! -x "$XBPS_MASTERDIR/bin/unzip" ]; then
 
 	check_installed_pkg unzip $unzip_version
 	if [ $? -ne 0 ]; then
-		echo "=> \`\`$pkg<EFBFBD><EFBFBD> package requires unzip for extraction."
+		echo "=> \`\`$save_pkgname<EFBFBD><EFBFBD> package requires unzip for extraction."
 		#
 		# Install dependencies required by unzip.
 		#
@@ -32,6 +42,3 @@ if [ ! -x "$XBPS_MASTERDIR/bin/unzip" ]; then
 	unset save_pkgname
 	unset unzip_version
 fi
-
-unzip_cmd=$XBPS_MASTERDIR/bin/unzip
-extract_cmd="$unzip_cmd -x $dfile -d $XBPS_BUILDDIR"