Wrap the remaining math functions in libc: __fpclassify*(), __flt_rounds(),
and ldexp().

ok millert@

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

Do not use <machine/float.h>, that is an deformed BSD-ism.
It turns out <float.h> is the right file to pull in.
ok millert

make an ieeefp regress pass; miod@ ok

I was on drugs when I commited this initially, and still do not understand
how I got libc to compile with this. Blush.

Replace this with a correct implementation, and write a faster fabs()
while the

I was on drugs when I commited this initially, and still do not understand
how I got libc to compile with this. Blush.

Replace this with a correct implementation, and write a faster fabs()
while there.

ok mickey@

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More fp-related libc pieces for hppa.
This enables awk to link.