[v3] Fix libstdc++/48760 (library proper part)

[Paolo Carlini]

Hi,

now that Jason implemented list-initialization of complex in mainline, 
we can fix this completely in the library. For 4_6-branch I mean to fix 
it only in C++03 mode, where we can do work in the body (the constructor 
is constexpr in C++0x mode).

Tested x86_64-linux, applied to mainline.

Paolo.

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