tdf#113225 - hold the solar mutex when entering from UNO.

http://crashreport.libreoffice.org/stats/crash_details/dff57662-1693-47f6-8b09-88f180d2e706

Change-Id: I4322c2113c300af97fb5854aac4a741b7027e6b1
Reviewed-on: https://gerrit.libreoffice.org/43623Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

extensions/source/update/ui/updatecheckui.cxx

@@ -898,6 +898,7 @@ void BubbleWindow::RecalcTextRects()
 static uno::Reference<uno::XInterface> SAL_CALL
 createInstance(const uno::Reference<uno::XComponentContext>& xContext)
 {
+    SolarMutexGuard aGuard;
     return  *new UpdateCheckUI(xContext);
 }