[Commits] [wesnoth/wesnoth] 87cee4: Fix build with MSVC

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: 87cee41680ae58d31f19f5758d44d2e2e5b7ab95
      https://github.com/wesnoth/wesnoth/commit/87cee41680ae58d31f19f5758d44d2e2e5b7ab95
  Author: Jyrki Vesterinen <sandgtx at gmail.com>
  Date:   2016-09-24 (Sat, 24 Sep 2016)

  Changed paths:
    M src/cursor.hpp
    M src/gui/widgets/helper.hpp
    M src/marked-up_text.hpp
    M src/minimap.hpp
    M src/sdl/image.hpp
    M src/sdl/window.hpp
    M src/units/drawer.hpp
    M src/video.hpp

  Log Message:
  -----------
  Fix build with MSVC

Microsoft's linker doesn't tolerate when a type is declared as a class
but forward declared as a struct.