pgsql: Add walreceiver API to get remote server version
Add walreceiver API to get remote server version
Add a separate walreceiver API function walrcv_server_version() to get
the version of the remote server, instead of doing it as part of
walrcv_identify_system(). This allows the server version to be
available even for uses that don't call IDENTIFY_SYSTEM, and it seems
This is for an upcoming patch, not currently used.