[m32c] build libstdc++; combined builds, libssp, and libgloss.

[DJ Delorie]

> It seems to me arm-elf --disable-newlib-supplied-syscalls has this
> issue as well. Is there a general solution?

You mean, besides --disable-libssp?  ;-)

libstdc++ doesn't have a problem.  libssp does.  Based on that fact
alone, I'd claim libssp is broken, or trying too hard to be clever
about shared libraries.  The other libraries use GCC_NO_EXECUTABLES,
which avoids the whole I-cant-link-yet problem.

Anyone know why libssp has to test-build shared libraries?