Prevent recursion attacks in EXT4Formatter.unlink (#415)

This issue doesn't affect any of our existing products. This is a
preemptive fix for downstream consumers of EXT4.format where, in some
platforms, leading `//` in the path could get resolved into a FileTree
that looks like this

```sh
/ 
 └──  / 
 └── usr
```

Sources/ContainerizationOS/Socket/Socket.swift

@@ -330,12 +330,7 @@ extension Socket {
 
         var cmsgBuf = [UInt8](repeating: 0, count: Int(CZ_CMSG_SPACE(Int(MemoryLayout<Int32>.size))))
         msg.msg_control = withUnsafeMutablePointer(to: &cmsgBuf[0]) { UnsafeMutableRawPointer($0) }
-
-        #if canImport(Glibc)
-        msg.msg_controllen = size_t(cmsgBuf.count)
-        #else
-        msg.msg_controllen = socklen_t(cmsgBuf.count)
-        #endif
+        msg.msg_controllen = numericCast(cmsgBuf.count)
 
         let recvResult = withUnsafeMutablePointer(to: &msg) { msgPtr in
             sysRecvmsg(handle.fileDescriptor, msgPtr, 0)