Fix use of unportable %m format

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/f1d869276f7c256ade9d5dd6a4d8143821cdac1c

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

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