Fix #80595: Resetting POSTFIELDS to empty array breaks request

This is mainly to work around https://github.com/curl/curl/issues/6455,
but not building the mime structure for empty hasht

Fix #80595: Resetting POSTFIELDS to empty array breaks request

This is mainly to work around https://github.com/curl/curl/issues/6455,
but not building the mime structure for empty hashtables is a general
performance optimization, so we do not restrict it to affected cURL
versions (7.56.0 to 7.75.0).

The minor change to bug79033.phpt is unexpected, but should not matter
in practice.

Closes GH-6606.

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Fix #79033: Curl timeout error with specific url and post

We must not set an empty mime structure as `CURLOPT_MIMEPOST`; instead
we set it to `NULL` if `CURLOPT_POSTFIELDS` has been set

Fix #79033: Curl timeout error with specific url and post

We must not set an empty mime structure as `CURLOPT_MIMEPOST`; instead
we set it to `NULL` if `CURLOPT_POSTFIELDS` has been set to an empty
array.

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