Skip compilation of tst_QLocalSocket::verifyListenWithDescriptor on VxWorks

This test uses socketpair which is not available on vxworks, so it fails
to compile.

Task-number: QTBUG-115777
Pick-to: 6.7
Change-Id: I46f3b4ebd937dc4ca2511381dd58451434e6a2fc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/network/socket/qlocalsocket/tst_qlocalsocket.cpp

@@ -1709,7 +1709,7 @@ void tst_QLocalSocket::verifySocketOptions()
 
 void tst_QLocalSocket::verifyListenWithDescriptor()
 {
-#ifdef Q_OS_UNIX
+#if defined(Q_OS_UNIX) && !defined(Q_OS_VXWORKS)
     QFETCH(QString, path);
     QFETCH(bool, abstract);
     QFETCH(bool, bound);