Code review comment for lp:~widelands-dev/widelands/bug-1378801

Compilation fails here:

[ 59%] Building CXX object src/editor/CMakeFiles/editor.dir/ui_menus/editor_main_menu.cc.o
In file included from /var/widelands/BZR/bug-1378801/src/ui_basic/panel.h:32:0,
                 from /var/widelands/BZR/bug-1378801/src/ui_basic/button.h:28,
                 from /var/widelands/BZR/bug-1378801/src/editor/ui_menus/editor_main_menu.h:23,
                 from /var/widelands/BZR/bug-1378801/src/editor/ui_menus/editor_main_menu.cc:20:
/var/widelands/BZR/bug-1378801/src/base/macros.h:70:11: error: expected unqualified-id before ‘const’
  TypeName(const TypeName&) = delete; ^
/var/widelands/BZR/bug-1378801/src/editor/ui_menus/editor_main_menu_random_map.h:106:2: note: in expansion of macro ‘DISALLOW_COPY_AND_ASSIGN’
  DISALLOW_COPY_AND_ASSIGN(WorldDescription);
  ^
/var/widelands/BZR/bug-1378801/src/base/macros.h:70:11: error: expected ‘)’ before ‘const’
  TypeName(const TypeName&) = delete; ^
/var/widelands/BZR/bug-1378801/src/editor/ui_menus/editor_main_menu_random_map.h:106:2: note: in expansion of macro ‘DISALLOW_COPY_AND_ASSIGN’
  DISALLOW_COPY_AND_ASSIGN(WorldDescription);
  ^
src/editor/CMakeFiles/editor.dir/build.make:537: recipe for target 'src/editor/CMakeFiles/editor.dir/ui_menus/editor_main_menu.cc.o' failed
make[2]: *** [src/editor/CMakeFiles/editor.dir/ui_menus/editor_main_menu.cc.o] Error 1
CMakeFiles/Makefile2:9236: recipe for target 'src/editor/CMakeFiles/editor.dir/all' failed
make[1]: *** [src/editor/CMakeFiles/editor.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2