runtime compiles on Windows

Signed-off-by: John Howard <jhoward@microsoft.com>

runtime/runtime_linux.go

@@ -0,0 +1,25 @@
+package runtime
+
+import "time"
+
+type Checkpoint struct {
+	// Timestamp is the time that checkpoint happened
+	Created time.Time `json:"created"`
+	// Name is the name of the checkpoint
+	Name string `json:"name"`
+	// Tcp checkpoints open tcp connections
+	Tcp bool `json:"tcp"`
+	// UnixSockets persists unix sockets in the checkpoint
+	UnixSockets bool `json:"unixSockets"`
+	// Shell persists tty sessions in the checkpoint
+	Shell bool `json:"shell"`
+	// Exit exits the container after the checkpoint is finished
+	Exit bool `json:"exit"`
+}
+
+// PlatformProcessState container platform-specific fields in the ProcessState structure
+type PlatformProcessState struct {
+	Checkpoint string `json:"checkpoint"`
+	RootUID    int    `json:"rootUID"`
+	RootGID    int    `json:"rootGID"`
+}