pgsql: pg_upgrade: error if run from top of new PGDATA on Windows

pg_upgrade: error if run from top of new PGDATA on Windows

Print a clear error message in this case, rather than wait for initdb
--sync-only to generate a "Permission denied" error.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/e4c3c99ac3d4777458ef3e94b037438b244b72b6

Modified Files
--------------
contrib/pg_upgrade/option.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

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