Revert previous. bluhm noted that it causes a regress failure.

Silence a clang warning on loss of precision

When converting a long or long long to a double, there may be loss
of precision and clang >= 10 warns about this unless there is a cast.
Add casts to sil

Silence a clang warning on loss of precision

When converting a long or long long to a double, there may be loss
of precision and clang >= 10 warns about this unless there is a cast.
Add casts to silence this warning - the code is designed to handle
precisely this loss of precision, so this is harmless.

From CheriBSD via FreeBSD

ok millert

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Remove FBSDID.

ok deraadt@

Remove excessive sys/cdefs.h inclusion
ok guenther millert kettenis

Finalize work on the math library. It's time to do this monster
commit, and deal with problems (if any) in tree.

Note that this adds the following functions. Ports with hacks might
need adjustment

Finalize work on the math library. It's time to do this monster
commit, and deal with problems (if any) in tree.

Note that this adds the following functions. Ports with hacks might
need adjustments.

nexttoward(3), fma(3), nexttowardf(3), fmaf(3), acoshl(3), asinhl(3),
atanhl(3), coshl(3), sinhl(3), tanhl(3), expl(3), expm1l(3), logl(3),
log10l(3), log1pl(3), log2l(3), modfl(3), cbrtl(3), hypotl(3),
powl(3), erfl(3), erfcl(3), lgammal(3), tgammal(3), ceill(3),
floorl(3), lrintl(3), llrintl(3), roundl(3), lroundl(3), llroundl(3),
truncl(3), fmodl(3), remainderl(3), remquol(3), nextafterl(3),
nexttowardl(3), fmal(3).

With this commit, our library implements all functionality required
by C99. Documentation bits will follow.

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