Apply fix for ld80 and ld128 submitted by Steve Kargl:

• Micro-optimization: use sincosl(x) instead of a call to cosl(x) and a call to sinl(x). Argument reduction is done once not twice.

• Use a long double constant instead of an invalid double constant.

• Spell scale2 correctly

He could not test ld128, so that patch is untested.

Submitted by: sgk at troutmask.apl.washington.edu (Steve Kargl)