Fix compilation for gcc/clang + tests for serialization

Former-commit-id: db9c93a1db3c57f268fc17e411402e071fc8675a

include/Nazara/Renderer/OpenGL.hpp

@@ -153,7 +153,6 @@ namespace Nz
 			static void OnContextChanged(const Context* newContext);
 			static void OnContextDestruction(const Context* context);
 	};
-}
 
 NAZARA_RENDERER_API extern PFNGLACTIVETEXTUREPROC            glActiveTexture;
 NAZARA_RENDERER_API extern PFNGLATTACHSHADERPROC             glAttachShader;
@@ -336,6 +335,8 @@ NAZARA_RENDERER_API extern GLX::PFNGLXSWAPINTERVALMESAPROC        NzglXSwapInter
 NAZARA_RENDERER_API extern GLX::PFNGLXSWAPINTERVALSGIPROC         glXSwapIntervalSGI;
 #endif
 
+}
+
 #endif // NAZARA_RENDERER_OPENGL
 
 #endif // NAZARA_OPENGL_HPP