[v3] cleanup testsuite for newlib targets

[Benjamin Kosnik]

> Ah, the offender seems to be (I overlooked that):
> 
> /gcc/spec/sb-vangelis-head-64/x86_64/install-200703230136/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../include/c++/4.3.0/c++0x_warning.h:36:2: 
> 
> error: #error This file requires compiler and library support for the
> upcoming ISO C++ standard, C++0x. This support is currently
> experimental, and must be enabled with the -std=c++0x or -std=gnu++0x
> compiler options.

Ok, well let me know if -std=gnu++0x works, if not I'll back out the 
Makefile.am bits.

best,
benjamin