AB_Buildings is from an older Abacus EZ_Scenery freeware library. Lights ss v2 is a Sidney Schwartz set of outdoor lights, light poles, etc. You probably got these as part of another scenery, so I'd just leave them on your system. (BTW just by coincidence, both will be included in the upcoming library update.)
EDIT: Neither of these libraries are included in the RTMM Part I, II, or III libraries.