Patch for math/libm-test.inc and sysdeps/ieee754/ldbl-96

[Ulrich Drepper]

"H . J . Lu" <hjl@valinux.com> writes:

> Since testing for existence of function may cause exceptions, I clear
> all exceptions in init_max_error. Or we can modify all those functions
> to set and check errno for ENOSYS before continue. 

I've added this patch as well.  Thanks,

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