mac packaging: capture output of signing call

by replacing system() call with backticks operator, since now the
macosx-codesign-app-bundle script doesn't redirect the output to
temp-files anymore (see e2fcbac50549ca96b092d64bd14a37cee6b12e0a)
That way the output can be added to the log in case of failure.

Change-Id: I954cbb2ed28cfe0f7e1e8ebc8f21aeb1711a4d9a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109816
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>

0 files changed, 0 insertions, 0 deletions