Inappropriate use of #if 0 in QXmlStream autotest

In qtbase/tests/auto/corelib/xml/qxmlstream/tst_qxmlstream.cpp, the body of the parseXSLTTestSuite() test function is disabled with #if 0, making it appear from the test output that this function passes with no problems. The #if 0 prevents users from seeing the more useful QEXPECT_FAIL message, though even that is inadequate, as it does not refer to any bug report, meaning that the maintainer of the affected module likely doesn't know that an issue even exists.