merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

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diff --git a/third_party/git/Documentation/RelNotes/2.6.2.txt b/third_party/git/Documentation/RelNotes/2.6.2.txt
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+Git v2.6.2 Release Notes
+========================
+
+Fixes since v2.6.1
+------------------
+
+ * There were some classes of errors that "git fsck" diagnosed to its
+   standard error that did not cause it to exit with non-zero status.
+
+ * A test script for the HTTP service had a timing dependent bug,
+   which was fixed.
+
+ * Performance-measurement tests did not work without an installed Git.
+
+ * On a case insensitive filesystems, setting GIT_WORK_TREE variable
+   using a random cases that does not agree with what the filesystem
+   thinks confused Git that it wasn't inside the working tree.
+
+ * When "git am" was rewritten as a built-in, it stopped paying
+   attention to user.signingkey, which was fixed.
+
+ * After "git checkout --detach", "git status" reported a fairly
+   useless "HEAD detached at HEAD", instead of saying at which exact
+   commit.
+
+ * "git rebase -i" had a minor regression recently, which stopped
+   considering a line that begins with an indented '#' in its insn
+   sheet not a comment, which is now fixed.
+
+ * Description of the "log.follow" configuration variable in "git log"
+   documentation is now also copied to "git config" documentation.
+
+ * Allocation related functions and stdio are unsafe things to call
+   inside a signal handler, and indeed killing the pager can cause
+   glibc to deadlock waiting on allocation mutex as our signal handler
+   tries to free() some data structures in wait_for_pager().  Reduce
+   these unsafe calls.
+
+ * The way how --ref/--notes to specify the notes tree reference are
+   DWIMmed was not clearly documented.
+
+ * Customization to change the behaviour with "make -w" and "make -s"
+   in our Makefile was broken when they were used together.
+
+ * The Makefile always runs the library archiver with hardcoded "crs"
+   options, which was inconvenient for exotic platforms on which
+   people want to use programs with totally different set of command
+   line options.
+
+ * The ssh transport, just like any other transport over the network,
+   did not clear GIT_* environment variables, but it is possible to
+   use SendEnv and AcceptEnv to leak them to the remote invocation of
+   Git, which is not a good idea at all.  Explicitly clear them just
+   like we do for the local transport.
+
+ * "git blame --first-parent v1.0..v2.0" was not rejected but did not
+   limit the blame to commits on the first parent chain.
+
+ * Very small number of options take a parameter that is optional
+   (which is not a great UI element as they can only appear at the end
+   of the command line).  Add notice to documentation of each and
+   every one of them.
+
+Also contains typofixes, documentation updates and trivial code
+clean-ups.