pkg-config: Mangle .pc files for native build to support older host distros
pkg-config: Mangle .pc files for native build to support older host distros

Add support for older host distros with pkg-config without sysroot support,
by not using sysroot support for building native:pkg-config and instead
mangle the .pc files in stage instead.

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