QT5 -- Enable build on 4.8.4 -OR- 5.2.0

New strategy to enable build on QT5 or QT4.8 is quite
simple to enact as most of the fixes for QT5 can be
applied to earlier releases.

This patch fixes up some of the special cases for QT5 so
they will continue to build on earlier releases.

src/OAuthDialog.cpp

@@ -79,7 +79,11 @@ OAuthDialog::urlChanged(const QUrl &url)
         QString code = url.toString().right(url.toString().length()-url.toString().indexOf("code=")-5);
 
         QByteArray data;
+#if QT_VERSION > 0x050000
         QUrlQuery params;
+#else
+        QUrl params;
+#endif
         QString urlstr = "";
 
         if (site == STRAVA) {
@@ -104,7 +108,11 @@ OAuthDialog::urlChanged(const QUrl &url)
         }
         params.addQueryItem("code", code);
 
+#if QT_VERSION > 0x050000
         data.append(params.query(QUrl::FullyEncoded));
+#else
+        data=params.encodedQuery();
+#endif
 
         QUrl url = QUrl(urlstr);
         QNetworkRequest request = QNetworkRequest(url);