internal/syscall/unix: use libc based fcntl for IsNonblock on aix and solaris
On aix and solaris (like on darwin) use libc fcntl to implement IsNonblock instead of Syscall(SYS_FCNTL, ...) which isn't supported. Change-Id: I989b02aa0c90b7e2dae025572867dda277fef8be Reviewed-on: https://go-review.googlesource.com/c/go/+/212600 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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