Platform: um... why isn't SDL_version.h pulled in implicitly?

I'd assume that if I include any SDL header, the version macros get
included too.

doc/changelog.dox

@@ -107,6 +107,9 @@ See also:
 -   The @ref Primitives::cylinderSolid() and @ref Primitives::coneSolid()
     primitives were missing a face when both caps and texture coordinates were
     enabled (see [mosra/magnum#386](https://github.com/mosra/magnum/issues/386))
+-   @ref Platform::Sdl2Application::Configuration::WindowFlag::Vulkan was
+    enabled conditionally only for SDL >= 2.0.6, but the version defines were
+    never included so it was always disabled
 
 @subsection changelog-latest-deprecated Deprecated APIs
 

src/Magnum/Platform/Sdl2Application.h

@@ -49,6 +49,7 @@
 /* SDL.h includes the world, adding 50k LOC. We don't want that either. */
 #include <SDL_keycode.h>
 #include <SDL_mouse.h>
+#include <SDL_version.h> /* huh, why is this not pulled in implicitly?! */
 #include <SDL_video.h>
 #include <SDL_scancode.h>