[Libreoffice] instructions for building on windows with OneGit

[Tor Lillqvist]

> Are there up-to-date instructions somewhere for building on Windows with the 
> new OneGit repos?

Well, the aspects that changed with the switch from several git repos to just one (or two, or three, depending on whether you want to include help and dictionaries or not) don't differ between platforms... So just clone the new "core" repo, and build using old instructions. Please report specific errors you get...

--tml