...because loplugin:constfields is wrapped in

  #if !defined _WIN32 //TODO, #include <sys/file.h>

Change-Id: I9b2a72ecd31f561c71be5a74a752344c24d40f26
Reviewed-on: https://gerrit.libreoffice.org/60598
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>