MFH: r503367

databases/pointcloud: Backport upstream PR for PostgreSQL 11 support.

PR: 238302
Approved by: lbartoletti@tuxfamily.org (maintainer)
Obtained from: https://github.com/pgpointcloud/pointcloud/commit/3e64c68dd4e0b9b9fdf0a74492ab49023161f6f1

Approved by: ports-secteam(miwi)