The class XElementAccess was missing the macro OOO_DLLPUBLIC_TEST,
and so it wasn't possible to use these test cases.

Change-Id: I358bb840c6088ea25b60ee57b8c69f31ab71ddbb
Reviewed-on: https://gerrit.libreoffice.org/64363
Tested-by: Jenkins
Reviewed-by: Jens Carl <j.carl43@gmx.de>