Windows: Fork execdrivers.go for Windows execdriver

Signed-off-by: John Howard <jhoward@microsoft.com>
Upstream-commit: 71bfb9367880632fd0dbda5e37e926448473ef46
Component: engine

components/engine/daemon/execdriver/execdrivers/execdrivers_linux.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package execdrivers
 
 import (

components/engine/daemon/execdriver/execdrivers/execdrivers_windows.go

@@ -0,0 +1,19 @@
+// +build windows
+
+package execdrivers
+
+import (
+	"fmt"
+
+	"github.com/docker/docker/daemon/execdriver"
+	"github.com/docker/docker/daemon/execdriver/windows"
+	"github.com/docker/docker/pkg/sysinfo"
+)
+
+func NewDriver(name, root, libPath, initPath string, sysInfo *sysinfo.SysInfo) (execdriver.Driver, error) {
+	switch name {
+	case "windows":
+		return windows.NewDriver(root, initPath)
+	}
+	return nil, fmt.Errorf("unknown exec driver %s", name)
+}