Fortran types in config/* files

Hi, Elena.

I noticed that in hdf5/config/linux-gnuclibc1 there are definitions for 
R_LARGE, R_INTEGER, HADDR_T, etc.  I thought these should be superfluous 
now that fortran types are detected automatically.  Did they just not get 
cleaned up, or was I misunderstanding?

If they need to be deleted (and it's safe to delete all of them), I can do 
it (and make sure that there aren't similar definitions in other config/*