...which is only used for extension components, and only while they are live-
deployed into an soffice process and thus offloaded to an additional uno
process (which never happens for bundled extensions), cf.
cppuhelper::ServiceManager::loadImplementation
(cppuhelper/source/servicemanager.cxx), and (at least non-bundled) extensions
should never use the "prefix" feature anyway, cf.
3bafe5f5 "Extension shared library components
must not use the 'prefix' feature."

Change-Id: I19c4b71029eccf0c4f3d4481ea5f3542205f685e