libm: Sprinkle whitespace fixes and rcsids on inverse trig functions.

No functional change intended.

libm: Do the weak alias dance for asin, acos, atan.

These are used internally by the complex trig functions, so they need
weak aliases.

add missing symbols for non long double architectures.

Enable asinl, acosl, logl, coshl, tanhl, atanhl, asinhl and acoshl

* Fix pkgsrc/math/py-numpy and pkgsrc/graphics/py-matplotlib, for example.

Bring in more long double functions from FreeBSD.