squashfs-tools: fix CVE-2021-41072

Backport patch to fix CVE-2021-41072. And 3 more ancestor commits are
backported too, otherwise it fails to compile.

CVE: CVE-2021-41072

Ref:
* https://nvd.nist.gov/vuln/detail/CVE-2021-41072



Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>