hdf5_ep

[svn-r15042] Bug fix.

Description:
The fortran Makefile.am used HDF_FORTRAN to indicate it is part of the
Fortran API source so that conclude.am will give fortran api prefix in the
test output.  The symbox HDF_FORTRAN is also used in configure for a different
purpose (indicated --enable-fortran). They conflicted.
Similar problem for the symbol HDF_CXX.

Solution:
Changed all the involved Makefile.am to use "FORTRAN_API" instead. It is
a more appropriate name.  Same for CXX_API.

Along the way, discovered that the Makefile.am of hl/fortran/test and
hl/cxx/test did not have those symbols at all.  Added them in.

Platform tested:
Kagiso serial and h5committested (kagisopp, smirom, linew).