New libstdc++ failures on AIX

[Paolo Carlini]

David Edelsohn wrote:

>	Assuming char is signed?
>
>FAIL: 27_io/filebuf_virtuals.cc (test for excess errors)
>Excess errors:
>/gcc/dje/src/libstdc++-v3/testsuite/27_io/filebuf_virtuals.cc: In static
>member function `static bool MyTraits::eq(char, char)':
>/gcc/dje/src/libstdc++-v3/testsuite/27_io/filebuf_virtuals.cc:545:
>warning: comparison is always true due to limited range of data type
>/gcc/dje/src/libstdc++-v3/testsuite/27_io/filebuf_virtuals.cc:546:
>warning: comparison is always true due to limited range of data type
>
Hi. This should be already fixed by the below, which I applied ~12 hours 
ago everywhere.

    http://gcc.gnu.org/ml/libstdc++/2003-02/msg00112.html

Paolo.