Remove "convert 'blah' using conversion_name" facility, because if it

Andrew Dunstan <andrew@dunslane.net>

Commit: 02138357ffc8c41a3d646035368712a5394f1f5f
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2007-09-24T01:29:30Z
Releases: 8.3.0
Remove "convert 'blah' using conversion_name" facility, because if it
produces text it is an encoding hole and if not it's incompatible
with the spec, whatever the spec means (which we're not sure about anyway).

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