hdf5_ep

[svn-r10655] Purpose:
Supper 12-byte long double for intel compiler.

Description:
Long double is 12-byte at intel compiler, currently we always set long double to 8-byte.
Change this for intel compiler. This is not the compelete change. H5Tinit.c needs also to be changed to support this.

Solution:

Platforms tested:
Not test yet, since it won't affect other compilers except intel, will test soon.

Misc. update: