pgsql: pg_upgrade: more Windows parallel/-j fixes

pg_upgrade: more Windows parallel/-j fixes
More fixes to handle Windows thread parameter passing.
Backpatch to 9.3 beta.
Patch originally from Andrew Dunstan

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4a67a9ac13495d69b4d3b560b63cafda9318b4f4

Modified Files
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contrib/pg_upgrade/parallel.c | 48 +++++++++++++++++++++++++++--------------
contrib/pg_upgrade/test.sh | 2 +-
2 files changed, 33 insertions(+), 17 deletions(-)

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