Missing SolarMutexGuards

...as can be seen e.g. with CppunitTest_dbaccess_dialog_save:

vcl::DisplayConnection::start
Application::GetDisplayConnection
Window::GetDragSource
Window::GetDropTarget
(anonymous namespace)::VCLXToolkit::getDropTarget
(anonymous namespace)::Frame::implts_startWindowListening
(anonymous namespace)::Frame::initialize
(anonymous namespace)::TaskCreatorService::implts_createFrame
(anonymous namespace)::TaskCreatorService::createInstanceWithArguments
framework::TaskCreator::createTask
framework::Desktop::findFrame
framework::LoadEnv::impl_loadContent
framework::LoadEnv::startLoading
framework::LoadEnv::loadComponentFromURL
framework::Desktop::loadComponentFromURL
unotest::MacrosTest::loadFromDesktop
DialogSaveTest::test
...

Change-Id: I9523ea47cab23d1f23f73a37d2d44453aa7d56a3