Windows: Updates Windows Vendoring

Updates windows dependent libraries for vendoing.

vendor/github.com/Microsoft/hcsshim/internal/uvm/modify.go

@@ -0,0 +1,6 @@
+package uvm
+
+// Modifies the compute system by sending a request to HCS
+func (uvm *UtilityVM) Modify(hcsModificationDocument interface{}) error {
+	return uvm.hcsSystem.Modify(hcsModificationDocument)
+}