hdf5_ep

[svn-r9162] Purpose:
Bug fix.

Description:
$CXX_BASENAME was not set yet if $CXX was pre-set to g++.  In turn,
CXX_flags are not picking up the g++ values.

Solution:
The correct solution should be done in configure which should have
setup CXX_BASENAME if $CC is set before sourcing this file.
Put a special patch here for g++ for now.
(Also added the recognization of icc as another name for Intel
compilers.)

Platforms tested:
No h5committest but tested in TG-NCSA since these changes affected
the IA64 platform only.

Misc. update: