outdir doesn't seem to be created. Use current directory for
pdb files as the obj files are already stored in the current
directory.

Change-Id: I41dd65714d314cd374cc5de073d48f1a58b18c56
Reviewed-on: https://gerrit.libreoffice.org/22888Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>