Same as the previous commit but this time for Linux.
Specifically, the glibc close() wrapper is a cancellation point;
the thread is unwound when close() is called when the thread is
in the "cancel" state.
That's according to spec and therefore arguably less severe than
MacOS's "EINTR without actually closing" behavior but we can avoid
the file descriptor leak altogether by sidestepping glibc and
making the system call directly.
Musl libc is unaffected, its close() wrapper doesn't check
the cancel state.
PR-URL: https://github.com/libuv/libuv/pull/2291
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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