Fix for tdf#60381: on Gerrit + Jenkins tested

Hi all,

I posted to Gerrit [2] a fix for tdf#6038 [2]1, issue described a
problem with Sharepoint, but that was not a WebDAV issue.

The fix adds two missing Windows API errors, I mapped them
to existent osl_File_E_.... for compatibility.

A description of what happens in Windows is here [3].

Here I'll add that in this way the LibO private lock file won't work,
due to illegal characters in the file name, but the user file lock is
taken care of by the WebClient service.

Unfortunately when trying to open a locked file you would not be told
the name of the user holding the file locked, as this is not possible
with the Windows file system

Reviewers are welcome :-).

--
Kind Regards,
Giuseppe Castagno
Acca Esse http://www.acca-esse.eu
giuseppe.castagno at acca-esse.eu
[1] https://bugs.documentfoundation.org/show_bug.cgi?id=60381
[2] https://gerrit.libreoffice.org/#/c/17412/
[3] https://bugs.documentfoundation.org/show_bug.cgi?id=60381#c10