Cleanup: Remove double definition of E_BOOK_CLIENT_ERROR
Cleanup: Remove double definition of E_BOOK_CLIENT_ERROR

The EBookClientError definition has been moved to libebook-contacts,
this is just removing a stale #define E_BOOK_CLIENT_ERROR which
was remaining in e-book-client.h

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