kdocbook dependent recipes fail when rm_work

KDocbook generates absolute path to docbookx.dtd, see kdedbx45.dtd.cmake in kdocbooc repo.

Example

kded/5.245.0-r0/recipe-sysroot/usr/share/kf6/kdoctools/customization/dtd/kdedbx45.dtd:89: warning: failed to load external entity "file:///........./kdoctools/5.245.0-r0/recipe-sysroot/usr/share/xml/docbook/schema/dtd/4.5/docbookx.dtd"

kded/5.245.0-r0/recipe-sysroot/usr/share/kf6/kdoctools/customization/dtd/modifications.elements:30: validity error : PEReference: %div.title.content; not found
| <!ELEMENT book %ho; ((%div.title.content;)?, bookinfo,

| man-kded6.8.docbook:7: parser error : Entity 'language' not defined
| <refentry lang="&language;">