merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'
This commit is contained in:
Vincent Ambo 2020-01-11 23:36:56 +00:00
commit 7ef0d62730
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Git v1.9.4 Release Notes
========================
Fixes since v1.9.3
------------------
* Commands that take pathspecs on the command line misbehaved when
the pathspec is given as an absolute pathname (which is a
practice not particularly encouraged) that points at a symbolic
link in the working tree.
* An earlier fix to the shell prompt script (in contrib/) for using
the PROMPT_COMMAND interface did not correctly check if the extra
code path needs to trigger, causing the branch name not to appear
when 'promptvars' option is disabled in bash or PROMPT_SUBST is
unset in zsh.