[v3] C99 config cleanup

[Benjamin Kosnik]

As previously posted here:
http://gcc.gnu.org/ml/libstdc++/2005-02/msg00232.html

This is the finished patch for the configuration bits. 

The goal is to have wchar_t/long long treated the same way, and to have
C99 bits clearly identified and in the same place.  I think this is an
improvement, and will be checking this in after I hear from the Solaris
tester (victim?), or 24 hrs. 

Next step it to make the include behavior consistent. I think that will be less work.

-benjamin

tested x86/linux
tested x86/linux --disable-c99 
tested x86/linux --disable-wchar_t

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