bitkeeper: mark as broken

pkgs/applications/version-management/bitkeeper/default.nix

···
     license     = stdenv.lib.licenses.asl20;
     platforms   = stdenv.lib.platforms.linux;
     maintainers = with stdenv.lib.maintainers; [ wscott thoughtpolice ];
+    broken      = true; # seems to fail on recent glibc versions
   };
 }