If they're not in core then they should be removed from oe-core's maintainers.
The recipes-lsb4/perl recipes were dropped in this commit: http://git.openembedded.org/openembedded-core/commit/?id=30fb4c8f329fe3aa3c528ffeba60ee7d702e873e But these are still in the maintainers.inc Seems they should be removed? If so, assign this bug to me and I will take care of it.
Patch in flight: http://lists.openembedded.org/pipermail/openembedded-core/2018-March/149123.html Also available on contrib: http://git.openembedded.org/openembedded-core-contrib/log/?h=timo/yocto-12582
http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=fac6432870aa1bb916408b0addb3d66fb2117ec6