[v3] c++0x <system_error> CD updates

[DJ Delorie]

This line in error_constants.h doesn't work with 16 bit targets:

      no_posix_equivalent = 1L << 16

In file included from /sata/dj/gnu/gcc/m32c-elf/m32c-elf/libstdc++-v3/include/system_error:44,
                 from /sata/dj/gnu/gcc/gcc/libstdc++-v3/src/functexcept.cc:32:
/sata/dj/gnu/gcc/m32c-elf/m32c-elf/libstdc++-v3/include/m32c-elf/bits/error_constants.h:176: error: enumerator value 65536l is too large for underlying type 'int'
make[4]: *** [functexcept.lo] Error 1
make[4]: Leaving directory `/sata/dj/gnu/gcc/m32c-elf/m32c-elf/libstdc++-v3/src'