send Describe Portal message in PQsendPrepare

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Hi.

What is the reason why PQsendPrepare function does not send a
Describe Portal message?

Just as a proof of concept, I wrote a very simple patch, attached, and
it *seems* to work.

Sending a Describe Portal message, make it possible for PQsendPrepare
function to *return* a PGresult with more useful informations, instead
of just the result status.



Thanks   Manlio Perillo
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