This allows using the logger on Windows with default settings
(not having TAGLOGGERTMP variable set).

Change-Id: Ic2be0ae90b2278b8c605aaa9f16f71fa16e7fcfe
Reviewed-on: https://gerrit.libreoffice.org/59657
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>