hdf5_ep

[svn-r10660] Purpose:
bug fix (sorta)

Description:
Rename H5_LLONG_TO_FP_CAST_WORKS to H5_LLONG_TO_FP_CAST_BROKEN

Solution:
Since a test for  H5_LLONG_TO_FP_CAST_WORKS is not present in the configure script,
the dtransform test would assume that this cast doesn't work and skip the test.  Change the variable around
so that, by default, it is assumed a long long to double cast does work.

Platforms tested:
minor change: copper, sol

Misc. update: