Use realpath() when setting AsbContext paths
Use realpath() when setting AsbContext paths

This makes icon symlinks work, e.g. fixing sysprof extraction.

ikeydoherty/appstream-glib,ximion/appstream-glib,kalev/appstream-glib,ximion/appstream-glib,ikeydoherty/appstream-glib,mitya57/appstream-glib,hughsie/appstream-glib,mitya57/appstream-glib,kalev/appstream-glib,superm1/appstream-glib,hughsie/appstream-glib,superm1/appstream-glib,ximion/appstream-glib,hughsie/appstream-glib