GCC 4.5 compatibility: no forward declarations for enums.

src/Context.h

@@ -37,6 +37,10 @@
 #include "OpenGL.h"
 #include "magnumVisibility.h"
 
+#ifdef CORRADE_GCC45_COMPATIBILITY
+#include "Version.h"
+#endif
+
 namespace Magnum {
 
 /** @todoc Resolve conflict with Audio/Context.h (Doxygen doesn't list this file) */

src/Platform/AbstractXApplication.h

@@ -41,6 +41,10 @@
 
 #include "Math/Vector2.h"
 
+#ifdef CORRADE_GCC45_COMPATIBILITY
+#include "Version.h"
+#endif
+
 namespace Magnum {
 
 class Context;

src/Platform/GlutApplication.h

@@ -38,6 +38,10 @@
 #include "OpenGL.h"
 #include <GL/freeglut.h>
 
+#ifdef CORRADE_GCC45_COMPATIBILITY
+#include "Version.h"
+#endif
+
 namespace Magnum {
 
 class Context;

src/Platform/Sdl2Application.h

@@ -42,6 +42,10 @@
 #include <Containers/EnumSet.h>
 #include <Corrade.h>
 
+#ifdef CORRADE_GCC45_COMPATIBILITY
+#include "Version.h"
+#endif
+
 namespace Magnum {
 
 class Context;

src/Shader.h

@@ -35,6 +35,10 @@
 #include "Magnum.h"
 #include "magnumVisibility.h"
 
+#ifdef CORRADE_GCC45_COMPATIBILITY
+#include "Version.h"
+#endif
+
 namespace Magnum {
 
 /**