[libc] Enable socket entrypoints in overlay mode (#195035) This is slightly tricky in that many of these functions depend on types (struct sockaddrs, msghdr, ...) and we cannot overlay types. However, this works because these functions are simple syscall wrappers which simply forward the data to the kernel -- so it's really the kernel that's defining these structures. This approach is compatible with libraries which implement these functions the same way, this includes at least glibc (on all architectures) and musl (on 32-bit architectures). 64-bit musl repacks the [c]msghdr structures to zero out padding fields, and overlaying that can lead to subtle bugs. However, I believe that overlaying musl is not a very interesting use case, so I'm leaving that as a TODO. If someone is interested in doing that, they can either exclude these entrypoints from the overlay or implement the musl-compatible repacking code.
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