pkg-config: Rewrite legacy use of _append and _prepend
pkg-config: Rewrite legacy use of _append and _prepend

sknsean/base,diorcety/oe-lite-base,hundeboll/base,esben/base,hundeboll/base,esben/base,hundeboll/base,kimrhh/base,diorcety/oe-lite-base,sknsean/base,sknsean/base,esben/base,kimrhh/base,kimrhh/base,moths/base,oe-lite/base,hundeboll/base,oe-lite/base,sknsean/base,esben/base,kimrhh/base,esben/base,oe-lite-rpi/base,moths/base,oe-lite/base,hundeboll/base,moths/base,jacobbarsoe/rpi-base,kimrhh/base,moths/base,esben/base,oe-lite/base,sknsean/base,jacobbarsoe/rpi-base,kimrhh/base,sknsean/base,hundeboll/base,moths/base,oe-lite/base,oe-lite-rpi/base,moths/base,oe-lite/base