t0014: generate deprecated command names dynamically

We have a few tests related to aliasing of deprecated commands. They use
whatchanged and pack-redundant because those are the only two deprecated
commands we have. Eventually those commands will be removed, at which
point these tests will be checking nothing useful (they'll just be
regular aliases, which we already cover in other tests).

We could remove them at that point, but the code to handle deprecated
commands will still remain. We probably do want to keep the tests around
for the eventual day that we deprecate more commands. So let's ask Git
for its list of deprecated commands, and if we don't have any, skip
those tests.

This also prevents an annoying corner case when your build directory
contains old build products. Right now those commands are marked as
deprecated builtins and treated specially; we allow aliases and never
look for them as dashed external commands. But after they are removed,
they aren't special anymore. If your directory happens to contain
hardlinks from the build of an older version, that confuses Git: it sees
the old hardlinks in place, thinks those are actual external commands,
and refuses to allow aliasing.

You can see that today like this:

  make
  make WITH_BREAKING_CHANGES=1 test

The first "make" creates git-whatchanged as a hardlink to Git, and the
second does not clean it up (it doesn't know about the whatchanged
command at all anymore). t0014 fails because Git won't create an alias
to the "external" whatchanged command.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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