Remove unused variables.

Change-Id: I44f4e4f454d86e7a53b44a9b3eb51879f97ae9c6
Reviewed-by: David Faure <david.faure@kdab.com>

src/corelib/mimetypes/qmimeprovider.cpp

@@ -580,9 +580,7 @@ void QMimeBinaryProvider::loadMimeTypePrivate(QMimeTypePrivate &data)
         return;
     }
 
-    QString comment;
     QString mainPattern;
-    const QString preferredLanguage = QLocale::system().name();
 
     for (QStringList::const_reverse_iterator it = mimeFiles.crbegin(), end = mimeFiles.crend(); it != end; ++it) { // global first, then local.
         QFile qfile(*it);