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### Motivation: Additional partial platform support. ### Modifications: * Create a new CNIOBSD module for OpenBSD, for general cleanliness, and make use of it throughout. Some of the changes are borrowed directly from CNIOLinux; some may technically be unnecessary; I am erring somewhat on expediency to functionality. * Since `malloc_size` is unavailable on OpenBSD, and some of the helpers make use of ManagedBufferPointer which makes use of it, mark some of this as unavailable as well. * Usual pthread optional typing changes, since pthread types are pointers on this platform. * Add conditionals to exclude other functionality not available here, like IP_RECVPKTINFO or IP_PKTINFO. * d_ino is a backwards-compatibility macro valued token for dirent, so instead, just expand with a conditional. * Use kqueue on OpenBSD. This necessitates adding some conditionals for type and feature compatibility. * The vsock API is unavailable on OpenBSD. ### Result: Tested the NIOTCPEchoClient and NIOTCPEchoServer appears to work and that swift-nio-ssh (hopefully wlog) builds with a local repository with these changes. Because NIOFS/_NIOFileSystem depend on some non-portable components, such as extended attributes, sendfile, non-portable linkat flags, and renameat2, this is only just partial OpenBSD support, which means that `swift build` on the full swift-nio project won't build cleanly, but at least the portable parts can be used to build servers and clients. This commit will mark the linked bug as fixed; I will open a new bug for file system support. Fixes #3383. --------- Co-authored-by: Rick Newton-Rogers <rnro@apple.com>