Fix delete/free confusions in EglApp and SdlApp.

src/eglapp.cpp

@@ -187,7 +187,7 @@ EglApp::~EglApp()
     XCloseDisplay(data->dpy);
 #endif
 
-    free(data);
+    delete data;
 }
 
 } /* namespace lol */

src/sdlapp.cpp

@@ -90,7 +90,7 @@ SdlApp::~SdlApp()
 #if defined USE_SDL
     SDL_Quit();
 #endif
-    free(data);
+    delete data;
 }
 
 } /* namespace lol */