pgsql: Improve pg_upgrade error report

Improve pg_upgrade error report

If the cluster alignments don't match, output this suggestion:

Likely one cluster is a 32-bit install, the other 64-bit

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/600250d0ed8848391ceb8fb382c299d085856dbc

Modified Files
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contrib/pg_upgrade/controldata.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

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