Fix Qt5 build

Author: m-kuhn

src/core/qgsogrutils.cpp

@@ -235,7 +235,7 @@ QgsFeatureList QgsOgrUtils::stringToFeatureList( const QString& string, const Qg
   if ( string.isEmpty() )
     return features;
 
-  QString randomFileName = QString( "/vsimem/%1" ).arg( QUuid::createUuid() );
+  QString randomFileName = QString( "/vsimem/%1" ).arg( QUuid::createUuid().toString() );
 
   // create memory file system object from string buffer
   QByteArray ba = string.toUtf8();
@@ -279,7 +279,7 @@ QgsFields QgsOgrUtils::stringToFields( const QString& string, QTextCodec* encodi
   if ( string.isEmpty() )
     return fields;
 
-  QString randomFileName = QString( "/vsimem/%1" ).arg( QUuid::createUuid() );
+  QString randomFileName = QString( "/vsimem/%1" ).arg( QUuid::createUuid().toString() );
 
   // create memory file system object from buffer
   QByteArray ba = string.toUtf8();