Add overload to SDL_GL_SetAttribute which accepts the SDL_GLprofile enum to prevent having to cast.

src/SDL2.cs

@@ -1432,6 +1432,13 @@ namespace SDL2
 			int value
 		);
 		
+		public static int SDL_GL_SetAttribute(
+			SDL_GLattr attr,
+			SDL_GLprofile profile
+		) {
+			return SDL_GL_SetAttribute(attr, (int)profile);
+		}
+
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
 		public static extern int SDL_GL_SetSwapInterval(int interval);