* adds --with-linked-git config option, that internally uses
  git-new-workdir
* consolidates various repo lists into bin/repo-list, and use
  that to dynamically add l10n repo

try to find all the supported db headers and libs in all
the "standard" directories

Previously if we aborted the download, it would delete dmake/dmake
which would then simply not be re-built, since we were checking for
the version in the solver in the bootstrap script - which would still
be there.

You can use it like 'make install', or 'make install prefix=/path', to override
what has been set by ./configure.

So that the message about what to do now (issue make and make dev-install) is
the last thing the user sees.

futhermore: the conf.log extraction method is no reliable. autoconf
has changed and newer version don't put it there.
furthermore, because of the post_download generation,
the conf.log get crowded by a second autoconf...

on windows, the configure check that some dll/exe are present.
these are in fact automatically downloaded by the ./download script.
but that script is run _after_ ./configure.
So the tests are postponed and run in a post_download script that is
invoked at the end of the download script.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

based on kohei blog on the subject, adapted for the 'bootstrap' build

Use bash substitution, instead of a piped sed

This is the first step in removing the need for the 'build' repository, and
its 'rawbuild' hack.