[patch] Fix a couple of libstdc++ failures on uclinux (Take 3)

[Benjamin Kosnik]

> >   "This fails because libstdc++ didn't get configured with the
> >   required C99 support.  That was because a configure test failed
> > with a missing reference to __fpclassify.  That was because the test
> >   wasn't linking with -lm."

Nice recovery Kazu. Thanks for the quick reversion.

-benjamin