don't include osl/file.hxx everywhere it's only needed
for --enable_formula_logger builds

Change-Id: I6ba30351b5a7afe975ea859e838930f9d1454c8c
Reviewed-on: https://gerrit.libreoffice.org/35766Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>