Add proper git-external-diff script to src/tools.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9d4625ad0b836538618e324b4ebbc3ba366447a1

Modified Files
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src/tools/git-external-diff |   22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)

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