[Patch] Missing definitions of static integral members in TR1

[Paolo Carlini]

Hi,

a few days ago I noticed this issue, which often isn't easy to see 
because the constants may be early optimized out during the compilation, 
for example when used for template arguments and nowhere else. Still, I 
think we should be conforming, while ""redundant"", at least for the 
user-visible ones. A special, nasty, case is:

  const int tuple_size<tuple<> >::value;

which, as far as I can see, should go in the library: I don't think 
there are other ways to improve on it and I'm excluding it from the 
patch, for now.

Tested x86-linux, would be a 4_2 candidate too.

Paolo.

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