/usr/share/postgresql/9.5/extension/plproxy--2.5.0--2.6.0.sql is in postgresql-9.5-plproxy 2.6-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | CREATE FUNCTION plproxy_validator (oid)
RETURNS void AS 'plproxy' LANGUAGE C;
CREATE OR REPLACE LANGUAGE plproxy HANDLER plproxy_call_handler VALIDATOR plproxy_validator;
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