curl: Avoid checking 'send' and 'recv' signatures

cURL detects the `send` and `recv` signatures using a large loop
of `try_compile` checks.  The results are used for the following:

* Casting argument types in calls to `send` and `recv`, perhaps
  to avoid conversion warnings.  We compile with `-w` anyway.

* Providing debug variants for `CURLDEBUG`, which we do not use.

Replace the detection loops with hard-coded results that should work
well enough everywhere.  This significantly reduces the number of
configure-time checks for building CMake on some platforms.

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