kiss: add back support for tgz archives (y lvm2 y)

kiss

@@ -166,7 +166,7 @@ pkg_extract() {
         # Only 'tar' archives are currently supported for extraction.
         # Any other file-types are simply copied to '$mak_dir' which
         # allows for manual extraction.
-        if [ -z "${src##*.tar*}" ]; then
+        if [ -z "${src##*.tar*}" ] || [ -z "${src##*.tgz}" ]; then
             tar xf "$src_dir/$1/${src##*/}" --strip-components 1 \
                 || die "$1" "Couldn't extract ${src##*/}"