Extension does not load on Postgres 12

[cocowalla]

postgres=# CREATE EXTENSION zson;
ERROR:  could not load library "/usr/lib/postgresql/12/lib/zson.so": /usr/lib/postgresql/12/lib/zson.so: undefined symbol: PG_RETURN_JSONB

I believe PG_RETURN_JSONB needs to be switched out to PG_RETURN_JSONB_P, and PG_GETARG_JSONB switched out for PG_GETARG_JSONB_P (I see a similar change made in another extension)

[cocowalla]

Gah, I just realised the code in v1.1 is older than master... will try building from master instead 😆