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wgengine: optimize isLocalAddr a bit

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On macOS/iOS, this removes a map lookup per outgoing packet.

Noticed it while reading code, not from profiles, but can't hurt.

BenchmarkGenLocalAddrFunc
BenchmarkGenLocalAddrFunc/map1
BenchmarkGenLocalAddrFunc/map1-4                16184868                69.78 ns/op
BenchmarkGenLocalAddrFunc/map2
BenchmarkGenLocalAddrFunc/map2-4                16878140                70.73 ns/op
BenchmarkGenLocalAddrFunc/or1
BenchmarkGenLocalAddrFunc/or1-4                 623055721                1.950 ns/op
BenchmarkGenLocalAddrFunc/or2
BenchmarkGenLocalAddrFunc/or2-4                 472493098                2.589 ns/op

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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