spelling fixes; from paul tagliamonte
any changes not taken noted on tech, but chiefly here i did not take the
cancelation - cancellation changes;

Change floating-point mode/environment control functions to operate on
both the hardfloat (FPU registers) and softfloat (software) state. This
makes these functions work correctly when mixing hardfl

Change floating-point mode/environment control functions to operate on
both the hardfloat (FPU registers) and softfloat (software) state. This
makes these functions work correctly when mixing hardfloat and softfloat
code. Disable trapping for softfloat since most (if not all) ARMv7 and
ARMv8 hardware that is on the market doesn't support trapping of
floating-point exceptions.

ok patrick@

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Reduce libm's exports and make internal calls go direct.
All dependencies on libc are now via reserved/standardized names.

ok kettenis@ millert@ deraadt@

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

fenv improvements and cleanups

fenv for arm