When using comphelper::PropertyMapEntry array to create a UNO property
set, we need to make sure we keep this instance while the property set
object is alive, else it would cause a very hard-to-debug problem down
the road...

In this particular case, the aExportInfoMap array instance was destroyed
when it went out of scope, but the xInfoSet which references it was used
afterward.

Change-Id: I02132b6b2e6bef7b461f0f77c2c4a3e911e42014