Bug 851770 - UnixSocket should only build when needed; r=mrbkap

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extra : rebase_source : 7d11ee8e65a71ee9d49f7915e240914e5fa0d37f
Bug 843868: Change sockaddr* to be a union of all possible sockaddr types; r=tzimmermann

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extra : rebase_source : 455aeb8c49bec2477a5ffea839a0ac3fe09434f7