Introduce containerd-shim-runhcs-v1 on Windows

Implements the containerd-shim-runhcs-v1 shim on Windows for the runtime
v2 shim API.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

vendor/github.com/Microsoft/hcsshim/internal/hns/zsyscall_windows.go

@@ -0,0 +1,74 @@
+// MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
+
+package hns
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/Microsoft/hcsshim/internal/interop"
+	"golang.org/x/sys/windows"
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+	modvmcompute = windows.NewLazySystemDLL("vmcompute.dll")
+
+	procHNSCall = modvmcompute.NewProc("HNSCall")
+)
+
+func _hnsCall(method string, path string, object string, response **uint16) (hr error) {
+	var _p0 *uint16
+	_p0, hr = syscall.UTF16PtrFromString(method)
+	if hr != nil {
+		return
+	}
+	var _p1 *uint16
+	_p1, hr = syscall.UTF16PtrFromString(path)
+	if hr != nil {
+		return
+	}
+	var _p2 *uint16
+	_p2, hr = syscall.UTF16PtrFromString(object)
+	if hr != nil {
+		return
+	}
+	return __hnsCall(_p0, _p1, _p2, response)
+}
+
+func __hnsCall(method *uint16, path *uint16, object *uint16, response **uint16) (hr error) {
+	if hr = procHNSCall.Find(); hr != nil {
+		return
+	}
+	r0, _, _ := syscall.Syscall6(procHNSCall.Addr(), 4, uintptr(unsafe.Pointer(method)), uintptr(unsafe.Pointer(path)), uintptr(unsafe.Pointer(object)), uintptr(unsafe.Pointer(response)), 0, 0)
+	if int32(r0) < 0 {
+		hr = interop.Win32FromHresult(r0)
+	}
+	return
+}