hdf5_ep

[svn-r12579] Description:
  -O3 flag causes compilation problems on most of the platforms with Intel compiler.
   The problem exists in all vesrions of icc compiler up to the newest 9.1

Solution:
   Use less agressive default setting O2 to avoid headache

Platforms tested: Linux 2.6 ia64 at UCAR (hal), cobalt (NCSA)