Make sure ecpg header files do not have a comment lasting several lines, one of

Michael Meskes <meskes@postgresql.org>

Commit: 79782b4075ab03708e3cc645b77b9a2635d85afa
Author: Michael Meskes <meskes@postgresql.org>
Date: 2016-02-01T12:19:43Z
Releases: 9.1.20
Make sure ecpg header files do not have a comment lasting several lines, one of
which is a preprocessor directive. This leads ecpg to incorrectly parse the comment as nested.

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