curl: add missing type sizes for 'long long' and '__int64'

When generating `curl_config.h`, add size information for `long long`
and `__int64` types.  These are needed as candidates for defining the
`ssize_t` type because on MSVC, `long` is not the same size as `size_t`.

This problem did not affect upstream curl because it computes the
`ssize_t` type in CMake code where all sizes are available.  CMake's
port computes it in preprocessor logic because universal binaries on
macOS do not know type sizes until compile time.

Fixes: #18477

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