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sio: platform-agnostic getprotobyname/num()

Recently the lua/socket.c code started using getprotobynumber_r()
and getprotobyname_r(). They exist on Linux, since the
non-reentrant versions of these functions aren't thread-safe.

But on MacOS these calls don't exist. The default ones are
declared as thread-safe out of the box in `man`, but not so in
online docs.

Lets make MacOS use the normal versions of these functions and
protect them with a mutex just in case. Wouldn't be a solution for
prod, but Mac is a dev-only platform for Tarantool, so not an
issue.

Closes #12362

NO_DOC=bugfix
NO_TEST=tested
NO_CHANGELOG=the bug wasn't released yet

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