pgsql: Have config_sspi_auth() permit IPv6 localhost connections.

Have config_sspi_auth() permit IPv6 localhost connections.

Windows versions later than Windows Server 2003 map "localhost" to ::1.
Account for that in the generated pg_hba.conf, fixing another oversight
in commit f6dc6dd5ba54d52c0733aaafc50da2fbaeabb8b0.  Back-patch to 9.0,
like that commit.

David Rowley and Noah Misch

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/5bd5968001c76a9b2d2885ad3b92c27bea024844

Modified Files
--------------
src/test/regress/pg_regress.c |   26 ++++++++++++++++++++++++++
src/tools/msvc/Mkvcbuild.pm   |    4 ++++
2 files changed, 30 insertions(+)