fdlibm notice, from src/render/log1pf_fdlibm.h (fdlibm's s_log1pf.c, as in glibc)

====================================================
Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

Developed at SunPro, a Sun Microsystems, Inc. business.
Permission to use, copy, modify, and distribute this
software is freely granted, provided that this notice
is preserved.
====================================================
Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
