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/usr/share/postgresql/9.6/extension/plpgsql--unpackaged--1.0.sql is in postgresql-9.6 9.6.7-0+deb9u1.

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/* src/pl/plpgsql/src/plpgsql--unpackaged--1.0.sql */

ALTER EXTENSION plpgsql ADD PROCEDURAL LANGUAGE plpgsql;
-- ALTER ADD LANGUAGE doesn't pick up the support functions, so we have to.
ALTER EXTENSION plpgsql ADD FUNCTION plpgsql_call_handler();
ALTER EXTENSION plpgsql ADD FUNCTION plpgsql_inline_handler(internal);
ALTER EXTENSION plpgsql ADD FUNCTION plpgsql_validator(oid);