This reverts commit 02021163.  The filter
appears to be split in two (com.sun.star.comp.oox.ppt.PowerPointImport
implementation oox::ppt::PowerPointImport from include/oox/ppt/pptimport.hxx for
im-/export, for export calling com.sun.star.comp.Impress.oox.PowerPointExport
implementation PowerPointExport from sd/source/filter/eppt/epptooxml.hxx) for no
good reason, so the com.sun.star.oox.PowerPointExport new-style service is
supporting a hack that should rather be cleaned up.

Conflicts:
	offapi/UnoApi_offapi.mk

Change-Id: I875192a68a8e3458dbfd74b4981a6a2e86ce44d7