IEEE floating point routines

[Burkhardt, Glenn]

I recommend that the standard Cygwin DLL include the standard routines
that query/control the FPU, such as 

fpsetmask()
fpsetround()
fpsetsticky()

These are available as a package at
http://www.macaulay.ac.uk/fearlus/floating-point/download.html

I've made a modification to use inline assembly instructions for the
control/status register access (attached).

I find these routines to be useful.  I'm not sure why they're not in
libc, but are defined in ieeefp.h.
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