[libcxx] r222282 - Modify tests to check that va_copy is only defined in C++11 and beyond.

[Joerg Sonnenberger]

On Tue, Nov 18, 2014 at 11:46:18PM -0000, Eric Fiselier wrote:
> URL: http://llvm.org/viewvc/llvm-project?rev=222282&view=rev
> Log:
> Modify tests to check that va_copy is only defined in C++11 and beyond.

Should we really assert that va_copy is *never* defined before C++11?
That seems contrary to other requirements like POSIX.

Joerg