pgsql: libpq: Set LDAP protocol version 3

libpq: Set LDAP protocol version 3

Some LDAP servers reject the default version 2 protocol. So set
version 3 before starting the connection. This matches how the
backend LDAP code has worked all along.

Co-authored-by: Andrew Jackson <andrewjackson947@gmail.com>
Reviewed-by: Pavel Seleznev <pavel.seleznev@gmail.com>
Discussion: /messages/by-id/CAKK5BkHixcivSCA9pfd_eUp7wkLRhvQ6OtGLAYrWC=k7E76LDQ@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5f19d13dfed35d8d4ed80d555f2d32b106771b61

Modified Files
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src/interfaces/libpq/fe-connect.c | 10 ++++++++++
1 file changed, 10 insertions(+)