Update libgadu yet again

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branch : release-2.x.y
Fix gg compilation on windows

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branch : release-2.x.y
Update windows NSS version to 3.16

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branch : release-2.x.y
Fix load of warnings on win32

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branch : release-2.x.y
libgadu: pick an upstream patch to fix warnings

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branch : release-2.x.y