hdf5_ep

[svn-r9474] Purpose:
Updating H5api_adpt.h to help the implementation of Fortran DLL on windows.


Description:
1. More functions need to be added prefix macro for exporting and importing
   fortran DLL on Windows.
2. unlink was _unlink on windows and use HDunlink to specify this.

Solution:

Platforms tested:
linux 2.4(h5committest not finished yet, but should work since the change is minor and it is passed with pgi compiler)

Misc. update: