[pgpool-committers: 10493] pgpool: Allow pcp clients to connect to IPv6 addresses.

[Tatsuo Ishii]

Allow pcp clients to connect to IPv6 addresses.

We have already allowed pcp server to connect to IPv6 addresses, but
pcp clients were not allowed to connect to them until today. This
commit allows pcp clients to connect to IPv6 addresses.

Discussion: [pgpool-general: 9481] Does pgpool 4.6.0 support pure ipv6 configuration?
https://www.pgpool.net/pipermail/pgpool-general/2025-May/009484.html
Backpatch-through: v4.6

Branch
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V4_6_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=f49d239a4e3b438e9e8b4fd7f6af501973ca16ad

Modified Files
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src/libs/pcp/pcp.c | 87 ++++++++++++++++++++++++++++++++++++------------------
1 file changed, 58 insertions(+), 29 deletions(-)