Mark dbghinst.EXE as executable (from Cygwin's point of view) if
necessary.
Warn that running the security fix installer containing gdiplus.dll
might cause a UAC prompt, and instruct the developer what to do. Be
more verbose in abnormal situations after running it.
Drop some pointless messages.
* 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
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.
