edataserver: Remove libsoup from the introspection includes
edataserver: Remove libsoup from the introspection includes

Soup-2.4 doesnt’t get along with Vala at the moment, and is breaking the
folks build. The include can be re-added once libsoup is fixed.

This partially reverts 874cfbd0c6dbb130489c27e9b50e51d8da6da398.

matzipan/evolution-data-server,Distrotech/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server