patch: Fix issues with hypotf.

[Stefan Seefeld]

The attached patch properly forward-declares hypotf as extern "C",
and falls back to ::hypot(double, double) if not HAVE_HYPOTF.
The patch is checked in.

Thanks,
		Stefan

-- 
Stefan Seefeld
CodeSourcery
stefan at codesourcery.com
(650) 331-3385 x718
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