pgsql: pg_upgrade: use single or double-quotes in command-line strings

pg_upgrade: use single or double-quotes in command-line strings

This is platform-dependent.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9d15292cfc581d2916778b79df0f0e86e032a677

Modified Files
--------------
src/bin/pg_upgrade/check.c | 12 +++++++-----
src/bin/pg_upgrade/pg_upgrade.h | 2 ++
2 files changed, 9 insertions(+), 5 deletions(-)

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