libweston: do not include config-parser.h

config-parser.h is a helper API that libweston core must never depend on. Using
it is a compositor frontend decision.

Including it in libweston.h would give the wrong message.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Status Job ID Name Coverage
  Container Prep
passed #246543
container_prep

00:00:19

 
  Build
passed #246544
build-native-meson

00:00:31