Backported patches to DD4hep master

Incorporate critical patches to DD4hep (back ported from master):

• https://github.com/AIDASoft/DD4hep/pull/849
• https://github.com/AIDASoft/DD4hep/pull/851

containers/jug/dev.Dockerfile

@@ -82,8 +82,8 @@ RUN echo "repos:" > $SPACK_ROOT/etc/spack/repos.yaml                    \
 
 ## Optional, normally commented out:
 ## Nuke the buildcache
-RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
-  rm -rf /var/cache/spack-mirror/*
+#RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
+#  rm -rf /var/cache/spack-mirror/*
 
 ## This variable will change whenevery either spack.yaml or our spack package
 ## overrides change, triggering a rebuild