Makefile.inc1: Run distrib-cleanup for worldtmp under I_REALLY_MEAN_N…

…O_CLEAN

Normally delete-old-files will handle this as part of _cleanworldtmp,
but if we're skipping that then we need to handle the few edge cases
that distrib-cleanup is there for.

Fixes:	9ccc906 ("Update CHERI libc++ to LLVM17")

Makefile.inc1

@@ -1200,6 +1200,10 @@ _bootstrap-tools:
 	${_+_}cd ${.CURDIR}; ${BMAKE} _NO_INCLUDE_COMPILERMK=t _cleanobj_fast_depend_hack
 .endif
 	${_+_}cd ${.CURDIR}; ${BMAKE} bootstrap-tools
+.if ${MK_CLEAN} != "yes" && defined(I_REALLY_MEAN_NO_CLEAN)
+	${_+_}cd ${.CURDIR}/etc; \
+	    ${MAKE} DIRPRFX=etc/ DESTDIR=${WORLDTMP} distrib-cleanup
+.endif
 	mkdir -p ${WORLDTMP}/usr ${WORLDTMP}/lib/geom ${WORLDTMP}/bin
 	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.usr.dist \
 	    -p ${WORLDTMP}/usr >/dev/null