Release build of 5.3.2.1 failed in codesign
apparently LibreOfficePython.framework was being signed more than
once, which cause codesign to fail and due to a recent
patch to harden the codesign wrapper, the build itself to fail

This does not address why some part are signed multiple time
but merely tell codesign to ignore the issue and just sign

This also fix a bash un-initialize variable warning and
capture output of codesign in case of error to be able to diagnose
things.

Change-Id: Ibd6752702feb2bdf5163ac30ed7a3fd9c86f961c
Reviewed-on: https://gerrit.libreoffice.org/35407Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>