FindHDF5: Fix Fortran compiler interrogation without HL library

When the HDF5 HL library is not available, FindHDF5 with Fortran does
not work.  The problem is because `cmake_hdf5_test.f90` tries to
"use h5lt" and "use h5ds", which comes from the HL library.
Then the basic compiler check fails completely.

The two "use" lines were added by commit 00405af0f1 (HDF5: Refactor the
use of compiler wrappers, 2016-04-04, v3.6.0-rc1~85^2) along with the
rest of the check.  Remove them.

Fixes: #22890