* generic/gdbtk-varobj.c (variable_value): Remove all instances

    * generic/gdbtk-varobj.c (variable_value): Remove all instances
        of error_last_message. It's gone.

        * generic/gdbtk-wrapper.c: Include exceptions.h
        * generic/gdbtk-cmds.c: Likewise.
        * generic/gdbtk-interp.c: Likewise.
        (gdbtk_interpreter_exec): Change return type to struct
        exception. Return exception_none.