BSD support #372
Description
FreeBSD is a supported platform for Swift 6.2. For projects that use swift-log as a dependency, it would be ideal if the types in Lock.swift had the appropriate type changes made (see e.g. apple/swift-certificates@63d06f4, apple/swift-certificates@9d7ff77, swiftlang/swift#81407, etc.).
I suspect there is probably some specific BSD support changes that need to be made elsewhere, too, such as stderr being non-optional.