ECPG patch for exec sql ifdef etc.

I just noticed that this patch added an attribute 'pertinent' to the _defines
structure. However, I cannot find a reference to this attribute anywhere
else. Since this happened before I'm afraid I removed some part of the patch
by committing my own changes I'd like to know what this is supposed to do.

And since I do not know who send the patch I just ask here.

Thanks anyway for this patch. 

Michael
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