[ooo-build] Updated handling of the git repositories

[Thorsten Behrens]

Jan Holesovsky wrote:
> OK - now, after some fixes I am much more confident in this framework,
> and ask everyone to configure with --with-git for the development.
> 
Hi all,

while playing with the new framework a bit more, I found it kinda
inconvenient that the stuff below ooo-build/clone is always a
stand-alone repo. Let me explain: I tend to have several checkouts
of ooo-build on my disk, on the one hand because I play with cross-
cutting feature work (that would require costly recompilation when
reverted), and on the other because I frequently at least need the
last-released version around.

So initially, I configured the new-style ooo-build via ...
--with-git=/local/shared-sources/clone, i.e. cloning from local repo
copies. That's a lot faster, but pulling/pushing ends up in the
local repos, so that sucks, and especially for pulling, can be a
pretty hard-to-diagnose error (wtf?! I've just pulled - why don't I
see the changes just announced by Joe Hacker?!).

Enter stage git-new-workdir - that's a script from the git/contrib,
that creates a new working directory plus index from a local repo,
but shares all the rest - so pulls / pushes e.g. all go to the
original remote repo.

Attached is a patch that unconditionally makes use of
git-new-workdir - I did not push that yet, as I may be yet unaware
of nasty side-effects when using git-new-workdir. Still, I consider
that pretty darn useful.

What do you think?

-- Thorsten
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