Define symbol for other compilers as nothing.
Tested: platypus

git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25624 dab4d1a6-ed17-0410-a064-d1ae371a2980
Changed the callback function integer type from INTEGER to INTEGER(C_INT) for portability, HDFFV-8909.



git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25626 dab4d1a6-ed17-0410-a064-d1ae371a2980