test: Pass -use-debug-libs for macdeploy test when built as debug

As this is a strong indication that Qt was also built in debug.
Otherwise the test will fail locally for a debug build.

Pick-to: 6.5
Change-Id: I5f494017f1d89f4076ccaca89aaa67738ef405a9
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

tests/auto/tools/macdeployqt/tst_macdeployqt.cpp

@@ -165,6 +165,9 @@ bool deploy(const QString &name, const QStringList &options, QString *errorMessa
     QString bundle = name + ".app";
     QString path = buildPath(name);
     QStringList args = QStringList() << bundle << options;
+#if defined(QT_DEBUG)
+    args << "-use-debug-libs";
+#endif
     if (lcTests().isDebugEnabled())
         args << "-verbose=3";
     return runProcess(g_macdeployqtBinary, args, errorMessage, path);