perl: fix CVE-2021-36770

Backport patch to fix CVE-2021-36770. And drop the section of code which
updates version.

CVE: CVE-2021-36770

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>