vchoi_fork

[svn-r12389] Purpose: Bug fix

Description: There was some logical confusion about the value of the macro
H5_HW_FP_TO_LLONG_NOT_WORKS.  It's supposed to be true for Windows, but false
for Unix machines.

Solution: Corrected.

Platforms tested: fuss(Linux) and amazon(MacOS 10.4) - simple change.