In pg_upgrade, document why we can't issue \n\n in the command logfile
on Windows.  Slightly cleanup log output on Windows given this
restriction.

Backpatch to 9.2.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/c4f18483b69830c725a9d45332144eb1926c5c26

Modified Files
--------------
contrib/pg_upgrade/exec.c       |   14 ++++++++++----
contrib/pg_upgrade/pg_upgrade.h |    6 +++++-
2 files changed, 15 insertions(+), 5 deletions(-)

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