Compile fixed for OSX.

Thanks @Maksym Hamarnyk for sending those.
Note: More patches are needed and I can only apply, not test, this.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6123 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CNSOGLManager.h

@@ -52,7 +52,7 @@ namespace video
 		const SExposedVideoData& getContext() const;
 
 		//! Change render context, disable old and activate new defined by videoData
-		bool activateContext(const SExposedVideoData& videoData);
+		bool activateContext(const SExposedVideoData& videoData, bool restorePrimaryOnZero) _IRR_OVERRIDE_;
 
         // Swap buffers.
         bool swapBuffers();
@@ -61,7 +61,7 @@ namespace video
         SIrrlichtCreationParameters Params;
 		SExposedVideoData PrimaryContext;
         SExposedVideoData CurrentContext;
-        
+
         NSOpenGLPixelFormat* PixelFormat;
 	};
 }