hdf5

[svn-r18876] Bug fix:
PGI v10 compiler does not like "xyz"[N] since "xyz" is really a void* constant,
not an array. By casting it to (char *) in the H5_IS_API macro and to use
pointer dereference make the compiler happy.

Tested: Jam(gcc, pgi production and development modes),
Amani (pgi production and development modes),
Linew (default mode)