Fix windows

Signed-off-by: Tibor Vass <tibor@docker.com>

hack/make/.go-autogen.ps1

@@ -14,7 +14,8 @@
 
 param(
     [Parameter(Mandatory=$true)][string]$CommitString,
-    [Parameter(Mandatory=$true)][string]$DockerVersion
+    [Parameter(Mandatory=$true)][string]$DockerVersion,
+    [Parameter(Mandatory=$false)][string]$Platform
 )
 
 $ErrorActionPreference = "Stop"
@@ -43,6 +44,7 @@ const (
     GitCommit          string = "'+$CommitString+'"
     Version            string = "'+$DockerVersion+'"
     BuildTime          string = "'+$buildDateTime+'"
+    PlatformName       string = "'+$Platform+'"
 )
 
 // AUTOGENERATED FILE; see hack\make\.go-autogen.ps1