net/netns: remove use of unsafe on Windows

Found while auditing unsafe for #921 via the list at:

https://github.com/tailscale/tailscale/issues/921#issuecomment-727365383

No need for unsafe here, so remove it.

cmd/tailscale/depaware.txt

@@ -56,7 +56,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/net/dnscache                                   from tailscale.com/control/controlclient+
      💣 tailscale.com/net/interfaces                                 from tailscale.com/cmd/tailscale/cli+
         tailscale.com/net/netcheck                                   from tailscale.com/cmd/tailscale/cli+
-     💣 tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
+        tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
         tailscale.com/net/packet                                     from tailscale.com/wgengine+
         tailscale.com/net/stun                                       from tailscale.com/net/netcheck+
         tailscale.com/net/tlsdial                                    from tailscale.com/control/controlclient+
@@ -76,6 +76,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/types/opt                                      from tailscale.com/control/controlclient+
         tailscale.com/types/strbuilder                               from tailscale.com/net/packet
         tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
+   W    tailscale.com/util/endian                                    from tailscale.com/net/netns
         tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
         tailscale.com/version                                        from tailscale.com/cmd/tailscale/cli+
         tailscale.com/version/distro                                 from tailscale.com/cmd/tailscale/cli+

cmd/tailscaled/depaware.txt

@@ -61,7 +61,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/net/dnscache                                   from tailscale.com/control/controlclient+
      💣 tailscale.com/net/interfaces                                 from tailscale.com/ipn+
         tailscale.com/net/netcheck                                   from tailscale.com/wgengine/magicsock
-     💣 tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
+        tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
      💣 tailscale.com/net/netstat                                    from tailscale.com/ipn/ipnserver
         tailscale.com/net/packet                                     from tailscale.com/wgengine+
         tailscale.com/net/stun                                       from tailscale.com/net/netcheck+
@@ -84,6 +84,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/opt                                      from tailscale.com/control/controlclient+
         tailscale.com/types/strbuilder                               from tailscale.com/net/packet
         tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
+   W    tailscale.com/util/endian                                    from tailscale.com/net/netns
         tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
         tailscale.com/util/pidowner                                  from tailscale.com/ipn/ipnserver
         tailscale.com/version                                        from tailscale.com/cmd/tailscaled+

net/netns/netns_windows.go

@@ -5,14 +5,14 @@
 package netns
 
 import (
-	"encoding/binary"
+	"math/bits"
 	"strings"
 	"syscall"
-	"unsafe"
 
 	"golang.org/x/sys/windows"
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
 	"tailscale.com/net/interfaces"
+	"tailscale.com/util/endian"
 )
 
 func interfaceIndex(iface *winipcfg.IPAdapterAddresses) uint32 {
@@ -114,7 +114,8 @@ func bindSocket6(c syscall.RawConn, ifidx uint32) error {
 // representation, suitable for passing to Windows APIs that require a
 // mangled uint32.
 func nativeToBigEndian(i uint32) uint32 {
-	var b [4]byte
-	binary.BigEndian.PutUint32(b[:], i)
-	return *(*uint32)(unsafe.Pointer(&b[0]))
+	if endian.Big {
+		return i
+	}
+	return bits.ReverseBytes32(i)
 }