Add -Wlogical-op to standard compiler flags, if supported

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/67c03c6f3ca3726fd99488b497432dea21ab8e2a

Modified Files
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configure    |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in |    1 +
2 files changed, 61 insertions(+), 0 deletions(-)

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