wgengine/magicsock: reenable magicsock tests on Windows

These tests are passing locally and on CI. They had failed earlier in
the day when first fixing up CI, and it is not immediately clear why. I
have cycled IPv6 support locally, but this should not have a substantial
effect.

Updates #7876

Signed-off-by: James Tucker <jftucker@gmail.com>

wgengine/magicsock/magicsock_test.go

@@ -150,9 +150,6 @@ type magicStack struct {
 // friends. You need to call conn.SetNetworkMap and dev.Reconfig
 // before anything interesting happens.
 func newMagicStack(t testing.TB, logf logger.Logf, l nettype.PacketListener, derpMap *tailcfg.DERPMap) *magicStack {
-	if runtime.GOOS == "windows" {
-		t.Skip("TODO(#7876): test regressed on windows while CI was broken")
-	}
 	privateKey := key.NewNode()
 	return newMagicStackWithKey(t, logf, l, derpMap, privateKey)
 }
@@ -346,9 +343,6 @@ func meshStacks(logf logger.Logf, mutateNetmap func(idx int, nm *netmap.NetworkM
 }
 
 func TestNewConn(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("TODO(#7876): test regressed on windows while CI was broken")
-	}
 	tstest.PanicOnLog()
 	tstest.ResourceCheck(t)
 
@@ -627,9 +621,6 @@ func TestTwoDevicePing(t *testing.T) {
 }
 
 func TestDiscokeyChange(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("TODO(#7876): test regressed on windows while CI was broken")
-	}
 	tstest.PanicOnLog()
 	tstest.ResourceCheck(t)
 
@@ -697,9 +688,6 @@ func TestDiscokeyChange(t *testing.T) {
 }
 
 func TestActiveDiscovery(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("TODO(#7876): test regressed on windows while CI was broken")
-	}
 	t.Run("simple_internet", func(t *testing.T) {
 		t.Parallel()
 		mstun := &natlab.Machine{Name: "stun"}
@@ -2170,9 +2158,6 @@ func newWireguard(t *testing.T, uapi string, aips []netip.Prefix) (*device.Devic
 }
 
 func TestIsWireGuardOnlyPeer(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("TODO(#7876): test regressed on windows while CI was broken")
-	}
 	derpMap, cleanup := runDERPAndStun(t, t.Logf, localhostListener{}, netaddr.IPv4(127, 0, 0, 1))
 	defer cleanup()
 
@@ -2227,9 +2212,6 @@ func TestIsWireGuardOnlyPeer(t *testing.T) {
 }
 
 func TestIsWireGuardOnlyPeerWithMasquerade(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("TODO(#7876): test regressed on windows while CI was broken")
-	}
 	derpMap, cleanup := runDERPAndStun(t, t.Logf, localhostListener{}, netaddr.IPv4(127, 0, 0, 1))
 	defer cleanup()