Rename functions to avoid future conflicts
Rename range_serialize/range_deserialize to
brin_range_serialize/brin_range_deserialize, since there are already
public range_serialize/range_deserialize in rangetypes.h.
Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Discussion: https://www.postgresql.org/message-id/CA+renyX0ipvY6A_jUOHeB1q9mL4bEYfAZ5FBB7G7jUo5bykjrA@mail.gmail.com