[fortran, patch] Add Fortran 2003 IEEE intrinsic modules

[FX]

> You can add glibc to the list to of libraries that may have issues
> with its long double math functions.

Yeah, I’m sure I can find bugs in any math library :)  And I’ve reported one in glibc a few days ago.
Also, IIRC, you did some great job in improving FreeBSD’s math library some time ago, so that will be an interesting platform to test my patch on!

Cheers,
FX