build, data: skk2ktrans keeps the SKK header; the recipe names every generator; an inert config line goes

An SKK dictionary's ";;" header carries its license notice, which
LICENSES/README.md relies on for kanji.dict, and skk2ktrans dropped
every ";;" line: a re-import as map/README describes lost the grant.
The leading comment block is kept now.  README's regenerate-and-verify
recipe omitted mktelex.py although verify-map checks its output; and
the Dockerfile set a shell variable named egrep in plan9's config that
9c never reads, calling egrep by name.

Dockerfile

@@ -35,7 +35,6 @@ RUN export DEBUGINFOD_URLS=https://debuginfod.archlinux.org \
 		"$debugdir/${buildid#??}.debug" \
 	&& rm -rf /root/.cache/debuginfod_client
 
-RUN printf "egrep='grep -E'\n" > /usr/lib/plan9/config
 RUN dbus-uuidgen --ensure=/etc/machine-id
 
 ENV PLAN9=/usr/lib/plan9