pgsql: On HP/UX, the structs used by ioctl(SIOCGLIFCONF) are named diff

On HP/UX, the structs used by ioctl(SIOCGLIFCONF) are named differently
than on other platforms, and only IPv6 addresses are returned. Because of
those two issues, fall back to ioctl(SIOCGIFCONF) on HP/UX, so that it at
least compiles and finds IPv4 addresses. This function is currently only
used for interpreting samehost/samenet in pg_hba.conf, which isn't that
critical.

Branch
------
REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/66bd917b591371811fe08c5071757b2ab654a6ff

Modified Files
--------------
src/backend/libpq/ip.c |    8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)