* tracepoint.c (tracepoint_operation): Call the modify_tracepoint_hook

    * tracepoint.c (tracepoint_operation): Call the modify_tracepoint_hook
        if it exists.
        Remove static declaration of free_actions.

        * tracepoint.h: Add declaration of free_actions.

        * gdbtk.c (gdbtk_modify_tracepoint): Define new tracepoint modification
hook.
        (gdbtk_print_frame_info): Define this hook so that current_source_symtab
        is set properly.
        (gdb_actions_command): Use free_actions () from tracepoint.c/h.