ecpg: Consistently use mm_strdup()

Peter Eisentraut <peter_e@gmx.net>

Commit: 14a85031b16239708d4f208528709153779c590d
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-06-30T02:14:56Z
Releases: 9.4.0
ecpg: Consistently use mm_strdup()

mm_strdup() is provided to check errors from strdup(), but some places
were failing to use it.

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