o Ported the msun and some other math bits from current FreeBSD libc.
This mostly replaces the EMX math, except for some double long variants
and some EMX specific ones. This is a risky change, but it's needed
if we're gonna catch up on the C99 bits and make libstdc++ happy.
There are some new headers, complex.h and fenv.h being the importan ones.
float.h have gotten some updates while math.h is totally replaced.
More than 100 standard functions were added!
NOTE: msun is using MATH_ERREXCEPT (math_errhandling) and not
MATH_ERRNO for error reporting.
I really hope this is not gonna uncover more OS/2 387 mess.