Fix use of unportable %m format

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/d7fb49314defee9fdbfcf3847d0855ac6ef4d166

Modified Files
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contrib/pg_upgrade/file.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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