QDir::mkpath shouldn't fail if parent directory denies access

The fix for QTBUG-30046 introduced this regression on Windows, which
meant that it became impossible to create a directory anywhere under
c:\Users for example, because each user only has permission to see
his own directory.

Task-number: QTBUG-32314
Change-Id: I1b35433265934d4978d4b0c23a946c3f920c710d
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/corelib/io/qfilesystemengine_win.cpp

@@ -1049,7 +1049,8 @@ bool QFileSystemEngine::createDirectory(const QFileSystemEntry &entry, bool crea
             if (slash) {
                 QString chunk = dirName.left(slash);
                 if (!mkDir(chunk)) {
-                    if (GetLastError() == ERROR_ALREADY_EXISTS) {
+                    const DWORD lastError = GetLastError();
+                    if (lastError == ERROR_ALREADY_EXISTS || lastError == ERROR_ACCESS_DENIED) {
                         bool existed = false;
                         if (isDirPath(chunk, &existed) && existed)
                             continue;