Remove obsolete replacement system() on darwin

Peter Eisentraut <peter_e@gmx.net>

Commit: 1d2e73a3dfdbd7168b323fa39879c60df6076412
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-08-18T16:00:00Z
Releases: 10.0
Remove obsolete replacement system() on darwin

Per comment in the file, this was fixed around OS X 10.2.

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