[v3] fixups for traits testsuite

[Benjamin Kosnik]

Adds in _GLIBCXX_USE_WCHAR_T guards for the new type_traits. In general, 
  it's better to separate out wchar_t testing via inclusion of "wchar_t" 
in the file or directory name, which results in the test of wchar_t 
being marked as "unsupported" for targets that don't support wchar_t, 
instead of being #ifdefd out.

However, current locale, numerics, and tr1 traits testing do use the 
ifdef approach, and it seems useful to continue this approach when not 
dealing with explicit wchar_t specializations. I've corrected the one 
case where _GLIBCXX_USE_WCHAR_T was being used with the naming convention.

In addition, I am going to add in a function to the configure checks for 
  -ffunction-sections in the hopes that this will fix the current issues 
with this on AIX/cygwin.

I also re-arranged the last of the requirements testscases.

I've just noticed I have the wrong dates on the ChangeLog entry. I'll 
fix this.

tested x86/linux

-benjamin
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