bug#8756: 23.3; vc-git.el doesn't use --follow argument in vc-git-print-log

[Steinar Bang <sb@dod.no>]

>>>>> Steinar Bang <sb@dod.no>:

> Wnen I think of it, it would be simpler to do a "git log --follow
> --name-only" and just regexp out the paths and commits and get an alist
> from commit to path, or something like that...?  Actually, you probably
> don't have to create that alist, just doing "git log --follow
> --name-only" just to get the path when you need it, maybe...?

This can be more compact, using
 : git log --follow --name-only --pretty=oneline

Here's the compact log for the example file:
#+begin_example
  sb@somehost:~$ git log --follow --name-only --pretty=oneline apps/share/emacs23/site-lisp/vc-git.el
  ae93673cf7a325ac6882b73a4280cfba3fca41e9 Make `vc-git-print-log' on a single file use "git log --follow" instead of "git rev
  apps/share/emacs23/site-lisp/vc-git.el
  4098e78805561b9af3e29184a8133baaf6d16621 Emacs 23.1 version of vc-git.el.
  apps/share/emacs23/site-lisp/vc-git.el
  a50a042e5af770928eaa8b636517d66bc2a13ee7 Load the locally modified vc-git.el only for emacs23 (fails on emacs22).
  apps/share/emacs23/site-lisp/vc-git.el
  8d304db76993a0da0894b3d30794a2c5ec4927fe Use the --follow flag on the "git log" command, to get full history across file mov
  apps/share/emacs/site-lisp/vc-git.el
  a92a3d062dac1b0ec5eece4ed6f9570e59f1a69b Adding the vc-git.el from emacs 23.3.
  apps/share/emacs/site-lisp/vc-git.el
#+end_example

Should be fairly easy to get a path for a commit, from this...?