[PATCH] libm/math: Use __math_xflow in obsolete math code

[Keith Packard]

Szabolcs Nagy <szabolcs.nagy@arm.com> writes:

> i think math errno is not particularly useful in newlib.

For embedded systems, I happen to agree, which is why picolibc builds
without errno support by default.

Thanks much for review and helpful suggestions!

-- 
-keith
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