/usr/share/postgresql/9.1/extension/plproxy--unpackaged--2.3.0.sql is in postgresql-9.1-plproxy 2.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | ALTER EXTENSION plproxy ADD FUNCTION plproxy_call_handler();
ALTER EXTENSION plproxy ADD LANGUAGE plproxy;
ALTER EXTENSION plproxy ADD FUNCTION plproxy_fdw_validator(text[], oid);
ALTER EXTENSION plproxy ADD FOREIGN DATA WRAPPER plproxy;
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