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 C99 complex support, for double and float.
Most complex function implementations are from the "c9x-complex" library,
originating from the "cephes" math library, see
http://www.netlib.org/cephes/, from Stephen L. Moshier, incorporated and
redistributed with the NetBSD license by permission of the author.

Error behaviour and other boundary conditions (branch cuts)
need to be looked at.

For namespace sanity, I've done the rename/weak alias procedure to
most of the exported functions which are also used internally.
Didn't do so for sin/cos(f) yet because assembler implementations use
them directly, and renaming functions shared between the main libm
and the machine specific "overlay" might raise binary compatibility
issues.

__STDC__ is always defined on NetBSD.

More trailing white space.

rcsid facism, WARNSify

Id -> NetBSD

LIBM_SCCS must be defined for the RCS ID to be defined.
This library will soon be used by DJGPP. And since memory is often tight
on DOS machines, there is little benifit to be had from including RCS IDs.

Float versions of math functions. From Ian Taylor (ian@cygnus.com), with
minor changes by me.

Add RCS ID's.

Include <math.h> instead of "fdlibm.h"
Byteorder fix for s_frexp.c.

branches: 1.1.1;
Initial revision