Skip TestQSaveFile::transactionalWriteErrorRenaming as user root.

You can't deny root access to a file.

Closes #201

tests/TestQSaveFile.cpp

@@ -156,6 +156,9 @@ void TestQSaveFile::transactionalWriteCanceled()
 void TestQSaveFile::transactionalWriteErrorRenaming()
 {
 #ifndef Q_OS_WIN
+    if (::geteuid() == 0) {
+        QSKIP("not valid running this test as root", SkipAll);
+    }
     const QString dir = tmpDir();
     QVERIFY(!dir.isEmpty());
     const QString targetFile = dir + QString::fromLatin1("/outfile");