[patch] LWG 2440 std::seed_seq::size() should be noexcept

[Jonathan Wakely]

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4383.html#2440

This was resolved as a defect and voted into the working paper in
Lenexa. As an extension we can also make the default constructor
noexcept.

Tested powerpc64le-linux, committed to trunk.
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