MinGW compilation fix

Pdf4QtViewer/pdfprogramcontroller.cpp

@@ -52,7 +52,7 @@
 #include <QToolBar>
 #include <QXmlStreamWriter>
 
-#ifdef Q_OS_WIN
+#if defined(PDF4QT_USE_PRAGMA_LIB)
 #pragma comment(lib, "Shell32")
 #endif
 

Pdf4QtViewer/pdftexttospeech.cpp

@@ -413,6 +413,9 @@ void PDFTextToSpeech::onPlayClicked()
             updatePlay();
             break;
         }
+
+        default:
+            break;
     }
 
     updateUI();