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/1.5.1.2.txt b/third_party/git/Documentation/RelNotes/1.5.1.2.txt
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+GIT v1.5.1.2 Release Notes
+==========================
+
+Fixes since v1.5.1.1
+--------------------
+
+* Bugfixes
+
+  - "git clone" over http from a repository that has lost the
+    loose refs by running "git pack-refs" were broken (a code to
+    deal with this was added to "git fetch" in v1.5.0, but it
+    was missing from "git clone").
+
+  - "git diff a/ b/" incorrectly fell in "diff between two
+    filesystem objects" codepath, when the user most likely
+    wanted to limit the extent of output to two tracked
+    directories.
+
+  - git-quiltimport had the same bug as we fixed for
+    git-applymbox in v1.5.1.1 -- it gave an alarming "did not
+    have any patch" message (but did not actually fail and was
+    harmless).
+
+  - various git-svn fixes.
+
+  - Sample update hook incorrectly always refused requests to
+    delete branches through push.
+
+  - git-blame on a very long working tree path had buffer
+    overrun problem.
+
+  - git-apply did not like to be fed two patches in a row that created
+    and then modified the same file.
+
+  - git-svn was confused when a non-project was stored directly under
+    trunk/, branches/ and tags/.
+
+  - git-svn wants the Error.pm module that was at least as new
+    as what we ship as part of git; install ours in our private
+    installation location if the one on the system is older.
+
+  - An earlier update to command line integer parameter parser was
+    botched and made 'update-index --cacheinfo' completely useless.
+
+
+* Documentation updates
+
+  - Various documentation updates from J. Bruce Fields, Frank
+    Lichtenheld, Alex Riesen and others.  Andrew Ruder started a
+    war on undocumented options.