Fix compilation with Qt5

We don't need QtWidgets,  and we don't need Uility::escape

src/owncloudcmd/simplesslerrorhandler.cpp

@@ -17,18 +17,8 @@
 
 #include <QtGui>
 #include <QtNetwork>
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-#include <QtWidgets>
-#endif
 
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
-namespace Utility {
-    //  Used for QSSLCertificate::subjectInfo which returns a QStringList in Qt5, but a QString in Qt4
-    QString escape(const QStringList &l) { return escape(l.join(';')); }
-}
-#endif
-
 bool SimpleSslErrorHandler::handleErrors(QList<QSslError> errors, QList<QSslCertificate> *certs, Account *account)
 {
     (void) account;