[Libreoffice] File systems "style" cleaning in libs-gui

[Francois Tigeot]

The attached patch removes most of the obsolete file system-related enums
in libs-gui and keeps only two "styles":
- NTFS for the Windows NT family of operating systems
- BSD Unix for all the rest

I've already pushed a commit to remove code related to the old Unix filesystem
with a limit of 14 characters per file name.
It has been obsolete since 1984 or so...

If there is no objection, I'll push this patch in a few days.

-- 
Francois Tigeot