Add required attribute to make it run on MacOS

Author: elvodqa

templates/EmptyOpenGL_SDL/source/app.d

@@ -18,7 +18,9 @@ int main()
 
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
-
+	// This is needed to run on macos
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+	
 	auto window = SDL_CreateWindow("OpenGL 3.2 App", SDL_WINDOWPOS_UNDEFINED,
 			SDL_WINDOWPOS_UNDEFINED, 400, 300, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
 	if (!window)