ezminc: mark broken

Package refuses to build with current GCC (11), but building with older
GCC causes error linking libminc and I don't want to pin a bunch of
deps.

A newer version is available upstream but it only works with ITK 5.0
(see https://github.com/BIC-MNI/EZminc/issues/15),
but we have 4.x and 5.2.x in tree and I'm reluctant to add 5.0 just for
one package (even ITK 4.x is only used by ants and ezminc and should be
removed as soon as ants is upgraded).

pkgs/applications/science/biology/EZminc/default.nix

@@ -25,5 +25,6 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ bcdarwin ];
     platforms = platforms.unix;
     license = licenses.free;
+    broken = true;  # ITK5 compatibility issue (https://github.com/BIC-MNI/EZminc/issues/15)
   };
 }