[issue30232] configure: support Git worktree

[STINNER Victor]

STINNER Victor added the comment:

I applied the enhanced (called bugfix by Brett ;-)) to 2.7, 3.5, 3.6 and master (3.7). I close the issue.

Example:

haypo at selma$ cat .git
gitdir: /home/haypo/prog/python/master/.git/worktrees/2.7

haypo at selma$ ./python 
Python 2.7.13+ (heads/test_ssl_27:dda4d78, May  3 2017, 03:25:45) 
[GCC 6.3.1 20161221 (Red Hat 6.3.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys._git
('CPython', 'heads/test_ssl_27', 'dda4d78')

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30232>
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