Add windows build constraint to windowskext package

firewall/interception/windowskext/doc.go

@@ -0,0 +1,4 @@
+// +build windows
+
+// Package windowskext provides network interception capabilites on windows via the Portmaster Kernel Extension.
+package windowskext

firewall/interception/windowskext/handler.go

@@ -1,3 +1,4 @@
+// +build windows
 package windowskext
 
 import (

firewall/interception/windowskext/kext.go

@@ -1,3 +1,4 @@
+// +build windows
 package windowskext
 
 import (

firewall/interception/windowskext/packet.go

@@ -1,3 +1,4 @@
+// +build windows
 package windowskext
 
 import (