hdf5_ep

[svn-r9515] Purpose:  Bug fix

Description:  For Intel 8.1 compiler, C99 standard has to be enabled to define macro ULLONG_MAX in its own header file limits.h.

Solution: Add flag -std=c99 to Intel compiler if the version is 8.1.

Platforms tested:  Tested v1.6 because this is a very simple change.