pgsql: Update Windows timezone mapping from Windows 7 and 10

Update Windows timezone mapping from Windows 7 and 10

This adds a couple of new timezones that are present in the newer
versions of Windows. It also updates comments to reference UTC rather
than GMT, as this change has been made in Windows.

Michael Paquier

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/e8aed974b0e2311c586b9e300a459e473e9a3271

Modified Files
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src/bin/initdb/findtimezone.c | 389 ++++++++++++++++++++++++++++++------------
1 file changed, 281 insertions(+), 108 deletions(-)