[REVIEW 3-6][REVIEW 3-6-1] FileStatus can have fewer fields than requested

[Stephan Bergmann]

Looking into MAB <https://bugs.freedesktop.org/show_bug.cgi?id=46249> 
"CRASH when browse to HD root directory in FILEOPEN Template dialog" 
(which apparently is crashing for yet another, unrelated reason, 
however), I noticed a regression introduced into LO 3.6.0 due to a 
misunderstanding of how osl_getFileStatus is actually working (esp. on 
Windows).

<http://cgit.freedesktop.org/libreoffice/core/commit/?id=e9febb63db2f62cd2b9505dfc4ceb3accc32aecb> 
"Related fdo#46249: FileStatus can have fewer fields than requested" is 
the (rather trivial) fix for that on master.  Please review for 
backporting to libreoffice-3-6 and libreoffice-3-6-1.  (I see Michael 
already cherry-picked it to libreoffice-3-6.)

Thanks,
Stephan