[API CHANGE] Removed two cppuhelper deprecated headers.

The headers cppuheader/compbase.hxx and implbase.hxx. They have been deprecated
since 2001. Moved the definitions of the deprecated functions to
cppuhelper/source/compat.cxx.

Signed-off-by: Stephan Bergmann <sbergman@redhat.com>, adding fixes and clean-up
in cppuhelper/source/compat.cxx and odk/Package_odk_headers.mk

Change-Id: I48b3cbf551b59d72614737a883a96aab55fc2090