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 v1.7.8.5 Release Notes
==========================
Fixes since v1.7.8.4
--------------------
* Dependency on our thread-utils.h header file was missing for
objects that depend on it in the Makefile.
* "git am" when fed an empty file did not correctly finish reading it
when it attempts to guess the input format.
* "git grep -P" (when PCRE is enabled in the build) did not match the
beginning and the end of the line correctly with ^ and $.
* "git rebase -m" tried to run "git notes copy" needlessly when
nothing was rewritten.
Also contains minor fixes and documentation updates.