Use "deprecated" API for OS X alias resolving on X 10.5

Change-Id: I68a49b95c9b4f4d1d0472a298f8b29d83435c88e
Reviewed-on: https://gerrit.libreoffice.org/8195
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>