tst_qresourceengine: Fix test for static MSVC builds

The test relies on the existence of qt-project.org in resources. It
contains mimetype data and is automatically added. For static builds on
MSVC it is only added if it is actually needed though.

Change-Id: Icd1d74466607196f9b635205f7cb4d9b300ec4b8
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

tests/auto/corelib/io/qresourceengine/tst_qresourceengine.cpp

@@ -29,6 +29,7 @@
 
 #include <QtTest/QtTest>
 #include <QtCore/QCoreApplication>
+#include <QtCore/QMimeDatabase>
 
 class tst_QResourceEngine: public QObject
 {
@@ -344,6 +345,11 @@ void tst_QResourceEngine::checkStructure()
     QFETCH(QLocale, locale);
     QFETCH(qlonglong, contentsSize);
 
+    // We rely on the existence of the root "qt-project.org" in resources. For
+    // static builds on MSVC these resources are only added if they are used.
+    QMimeDatabase db;
+    Q_UNUSED(db);
+
     bool directory = (containedDirs.size() + containedFiles.size() > 0);
     QLocale::setDefault(locale);