Revert "gwyddion: mark as broken"

pkgs/applications/science/chemistry/gwyddion/default.nix

@@ -68,6 +68,7 @@ stdenv.mkDerivation rec {
     license = lib.licenses.gpl2;
     platforms = with lib.platforms; linux ++ darwin;
     maintainers = [ lib.maintainers.cge ];
-    broken = true; # Build error: h5py-3.9.0 not supported for interpreter python2.7
+    # never built on aarch64-darwin since first introduction in nixpkgs
+    broken = stdenv.isDarwin && stdenv.isAarch64;
   };
 }