net: ensure that net and net.unix can be imported together in the same program

vlib/net/address_test.v

@@ -1,18 +1,5 @@
 module net
 
-$if windows {
-	$if msvc {
-		// Force these to be included before afunix!
-		#include <winsock2.h>
-		#include <ws2tcpip.h>
-		#include <afunix.h>
-	} $else {
-		#include "@VMODROOT/vlib/net/afunix.h"
-	}
-} $else {
-	#include <sys/un.h>
-}
-
 fn test_diagnostics() {
 	dump(aoffset)
 	eprintln('--------')