Remove regression tests' CREATE FUNCTION commands for unused C functions.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 5cedaeca261bfa330981e9e9abc7fb01b5a246cb
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-02-27T20:04:53Z
Releases: 9.4.18
Remove regression tests' CREATE FUNCTION commands for unused C functions.

I removed these functions altogether in HEAD, in commit db3af9feb, and
it emerges that that causes trouble for cross-branch upgrade testing.
We could put back stub functions but that seems pretty silly.  Instead,
back-patch a minimal subset of db3af9feb, namely just removing the
CREATE FUNCTION commands.

Discussion: https://postgr.es/m/11927.1519756619@sss.pgh.pa.us

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