Keep the macro "complex" in C++03

[Paolo Carlini]

Hi,

>2013-02-13  Marc Glisse  <marc.glisse@inria.fr>
>
> 	PR libstdc++/56111
> 	* include/std/complex (complex): Undefine.
> 	* include/c_compatibility/complex.h (complex): Only undefine if
> 	<complex> has been included.
> 	* testsuite/26_numerics/complex/56111.cc: New testcase.

Patch is Ok, thanks. You may want to remove the test variable: it serves no purpose in a dg-do compile testcase with no VERIFYs in it.

Thanks again!
Paolo