CMake: use check_symbol_exists also for inet_pton

It doesn't make much sense to only check if the function can be linked
when it's not declared in any header and that is treated as an error.
With the correct target Windows version set, the function is declared
in ws2tcpip.h and the comment above the modified block is invalid.

Also, move the definition of `_WIN32_WINNT` up to before all symbol
availability checks so that we don't have to care which ones must be
done after it.

Tested with Visual Studio 2019 and current MinGW-w64.

Closes https://github.com/curl/curl/pull/4808

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