Fix library path issues

gui/spkdialog.cpp

@@ -50,7 +50,6 @@ void SpkDialog::AddButton(QString text, SpkUi::SpkButtonStyle style)
     case SpkUi::SpkButtonStyle::Warn:
       b->setObjectName("spk_styling_warnbtn");
       break;
-    case SpkUi::SpkButtonStyle::Normal:
     default:
       break;
   }

gui/spkui_general.cpp

@@ -79,8 +79,11 @@ namespace SpkUi
   void PrepareForDeepinDesktop()
   {
 #ifndef NDEBUG
-    // Normally it's installed to system library path
     qApp->addLibraryPath(qApp->applicationDirPath() + "/plugin/dtkplugin");
+#else
+    // You must `make install' before these work in release mode
+    qApp->addLibraryPath("/usr/local/lib");
+    qApp->addLibraryPath("/usr/lib");
 #endif
     QPluginLoader p("libspkdtkplugin");
     if(p.load())