Remove excessive sys/cdefs.h inclusion
ok guenther millert kettenis

- remove isinff, isnanf. this has been moved to libc
- remove never-enabled signbit. libc has is now
- add C99 implementations, from freebsd, for nan(), nanf() (needed
to write _digittoint for it),

- remove isinff, isnanf. this has been moved to libc
- remove never-enabled signbit. libc has is now
- add C99 implementations, from freebsd, for nan(), nanf() (needed
to write _digittoint for it), exp2(), exp2f(), remquo(), remquof(),
needed STRICT_ASSIGN macro for math_private.h
- bump major
man pages will follow
exp2{,f} has been requested by chl@
ok millert@

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