- add long double signbit
- make long double versions weak aliases to double versions,
on archs where long doubles are 64 bits
- no need to have two finites. finite() and finitef() are
non-standard

- add long double signbit
- make long double versions weak aliases to double versions,
on archs where long doubles are 64 bits
- no need to have two finites. finite() and finitef() are
non-standard 3BSD obsolete versions of isfinite. remove
from libm. make them weak_alias in libc to __isfinite and
__isfinitef instead. similarly make 3BSD obsolete versions
of isinf, isinff, isnan, isnanf weak_aliases to C99's
__isinf, __isinff, __isnan, __isnanf
- bump major
ok millert@

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