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/1.5.2.2.txt b/third_party/git/Documentation/RelNotes/1.5.2.2.txt
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+GIT v1.5.2.2 Release Notes
+==========================
+
+Fixes since v1.5.2.1
+--------------------
+
+* Usability fix
+
+  - git-gui is shipped with its updated blame interface.  It is
+    rumored that the older one was not just unusable but was
+    active health hazard, but this one is actually pretty.
+    Please see for yourself.
+
+* Bugfixes
+
+  - "git checkout fubar" was utterly confused when there is a
+    branch fubar and a tag fubar at the same time.  It correctly
+    checks out the branch fubar now.
+
+  - "git clone /path/foo" to clone a local /path/foo.git
+    repository left an incorrect configuration.
+
+  - "git send-email" correctly unquotes RFC 2047 quoted names in
+    the patch-email before using their values.
+
+  - We did not accept number of seconds since epoch older than
+    year 2000 as a valid timestamp.  We now interpret positive
+    integers more than 8 digits as such, which allows us to
+    express timestamps more recent than March 1973.
+
+  - git-cvsimport did not work when you have GIT_DIR to point
+    your repository at a nonstandard location.
+
+  - Some systems (notably, Solaris) lack hstrerror() to make
+    h_errno human readable; prepare a replacement
+    implementation.
+
+  - .gitignore file listed git-core.spec but what we generate is
+    git.spec, and nobody noticed for a long time.
+
+  - "git-merge-recursive" does not try to run file level merge
+    on binary files.
+
+  - "git-branch --track" did not create tracking configuration
+    correctly when the branch name had slash in it.
+
+  - The email address of the user specified with user.email
+    configuration was overridden by EMAIL environment variable.
+
+  - The tree parser did not warn about tree entries with
+    nonsense file modes, and assumed they must be blobs.
+
+  - "git log -z" without any other request to generate diff still
+    invoked the diff machinery, wasting cycles.
+
+* Documentation
+
+  - Many updates to fix stale or missing documentation.
+
+  - Although our documentation was primarily meant to be formatted
+    with AsciiDoc7, formatting with AsciiDoc8 is supported better.