[cvs-nhc98] Re-instate hGetFileName to IO library.

malcolm: Tue Dec 18 19:47:10 CET 2001 Update of /usr/src/master/nhc/include In directory hinken:/tmp/cvs-serv10166/include Modified Files: IO.hi IO.T.hi Log Message: Re-instate hGetFileName to IO library. Although it is not strictly Haskell'98, it appears to be needed elsewhere in the library implementation.