hdf5_ep

[svn-r6856] Purpose:
    Bug Fix

Description:
    When doing a "configure" using the h5cc script as the compiler, it
    would fail to accept the "-E" flag as running the preprocessor. The
    problem was that it was trying to link the file afterwards. Of
    course, the file wouldn't be there, so it would fail.

Solution:
    Changed it so that if the -E flag is used, then we don't try to link
    (this is how it's done in mpicc...I must have copied it wrongly).

Platforms tested:
    Linux & Kelgia (small change not needing full testing)

Misc. update: