perl: skip tests that are not useful

perl: skip tests that are not useful

Some tests, like the one that compares the hashes for a list of files
against those stored in a .dat file, don't make sense for downstream
distros packaging perl.

Backport a patch from upstream that allows skipping of these tests at
runtime. Also remove the local patch trying to keep hashes up-to-date
for one of those tests.

Fixes [YOCTO #12787]

Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>