haxe: add "Constraints" to the windows varient

library/haxe

@@ -20,6 +20,7 @@ Tags: 3.4.2-windowsservercore, 3.4-windowsservercore
 Architectures: windows-amd64
 GitCommit: ba6ec51ec4db8248066b9a294b22bcbfd83a20f4
 Directory: 3.4/windowsservercore
+Constraints: windowsservercore
 
 Tags: 3.3.0-rc.1-stretch, 3.3.0-stretch, 3.3-stretch, 3.3.0-rc.1, 3.3.0, 3.3
 Architectures: amd64
@@ -40,6 +41,7 @@ Tags: 3.3.0-rc.1-windowsservercore, 3.3.0-windowsservercore, 3.3-windowsserverco
 Architectures: windows-amd64
 GitCommit: ba6ec51ec4db8248066b9a294b22bcbfd83a20f4
 Directory: 3.3/windowsservercore
+Constraints: windowsservercore
 
 Tags: 3.2.1-stretch, 3.2-stretch, 3.2.1, 3.2
 Architectures: amd64
@@ -60,6 +62,7 @@ Tags: 3.2.1-windowsservercore, 3.2-windowsservercore
 Architectures: windows-amd64
 GitCommit: ba6ec51ec4db8248066b9a294b22bcbfd83a20f4
 Directory: 3.2/windowsservercore
+Constraints: windowsservercore
 
 Tags: 3.1.3-stretch, 3.1-stretch, 3.1.3, 3.1
 Architectures: amd64
@@ -80,4 +83,5 @@ Tags: 3.1.3-windowsservercore, 3.1-windowsservercore
 Architectures: windows-amd64
 GitCommit: ba6ec51ec4db8248066b9a294b22bcbfd83a20f4
 Directory: 3.1/windowsservercore
+Constraints: windowsservercore