abuild: add support for uncompressed tar archives

abuild.in

@@ -404,6 +404,9 @@ default_unpack() {
 	for u in $source; do
 		local s="$SRCDEST/${u##*/}"	# $(basename $s)
 		case "$s" in
+			*.tar)
+				msg "Unpacking $s..."
+				tar -C "$srcdir" -xf "$s" || return 1;;
 			*.tar.gz|*.tgz)
 				msg "Unpacking $s..."
 				tar -C "$srcdir" -zxf "$s" || return 1;;