Revert "kheaders: substituting --sort in archive creation"

[ Upstream commit 49c386eb ]

This reverts commit 700dea5a.

The reason for that commit was --sort=ORDER introduced in
tar 1.28 (2014). More than 3 years have passed since then.

Requiring GNU tar 1.28 should be fine now because we require
GCC 5.1 (2015).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Stable-dep-of: 3bd27a84 ("kheaders: explicitly define file modes for archived headers")
Signed-off-by: Sasha Levin <sashal@kernel.org>