Add a config header for this, and split yrs.hxx in two because the actual libyrs.h is only needed in 2 files. Change-Id: I30453fda3082f977e328ed56a4a101743ecdd586 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/185329 Tested-by: Jenkins Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>