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

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

ok kettenis@ millert@ deraadt@

It's been a quarter century: we can assume volatile is present with that name.

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

fenv improvements and cleanups

fenv for sparc; mostly cloned from sparc64

fenv for i386, and sparc64; from matthew@
not reviewed yet, but it's better to track changes in cvs