Moved Informix stuff to its own compat library. Interval datetype is now fully functional.

Michael Meskes <meskes@postgresql.org>

Commit: 999f12982e6180a88aedc76f8e6e25f461367761
Author: Michael Meskes <meskes@postgresql.org>
Date: 2003-03-30T11:48:19Z
Releases: 7.4.1
Moved Informix stuff to its own compat library. Interval datetype is now fully functional.

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