Fix building of tests
Fix building of tests

The tests are not using the libsignonextension library, and don't need that
debug header included.

maemo-foss/accounts-sso-signon,plotters/accounts-sso.signond,maemo-foss/accounts-sso-signon,maemo-foss/accounts-sso-signon,plotters/accounts-sso.signond,plotters/accounts-sso.signond