Gah, rintl() is used internally, so add a macro for the fourth possiblity,
a cloning a non-standard, long double function which _is_ used from the
matching plain double function

build failured pointed out by deraadt@

Fix build of sincosl on machines where long double == double

ok deraadt@

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

ok kettenis@ millert@ deraadt@

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

ok kettenis@ millert@ deraadt@