Fix 4 warnings on OSX

Source/Core/DolphinWX/Src/GLInterface/WX.cpp

@@ -50,6 +50,7 @@ bool cInterfaceWX::Create(void *&window_handle)
 	GLWin.glCanvas->Show(true);
 	if (GLWin.glCtxt == NULL) // XXX dirty hack
 		GLWin.glCtxt = new wxGLContext(GLWin.glCanvas);
+	return true;
 }
 
 bool cInterfaceWX::MakeCurrent()

Source/Plugins/Plugin_VideoSoftware/Src/EfbInterface.cpp

@@ -355,7 +355,7 @@ namespace EfbInterface
                 dstClr = (~srcClr) & dstClr;
                 break;
             case 5:  // noop
-                dstClr = dstClr;
+		// Do nothing
                 break;
             case 6:  // xor
                 dstClr = srcClr ^ dstClr;