[v3] libstdc++/51438

[Paolo Carlini]

Hi,

this fixes the issue in the obvious way, by explicitly declaring 
nested_exception::~nested_exception noexcept, necessary today due to 
PR50043. I took the occasion to deploy _GLIBCXX_USE_NOEXCEPT in more 
places, exception classes and chrono.

Tested x86_64-linux, -enable-libstdcxx-time=rt, committed.

Thanks,
Paolo.

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