hdf5-fortran: Mark broken on Darwin

Never succeeded.

https://hydra.nixos.org/build/62044922

pkgs/tools/misc/hdf5/default.nix

···
     license = stdenv.lib.licenses.free; # BSD-like
     homepage = https://www.hdfgroup.org/HDF5/;
     platforms = stdenv.lib.platforms.unix;
+    broken = (gfortran != null) && stdenv.isDarwin;
   };
 }