include/gdb:

include/gdb:
        * callback.h (struct host_callback_struct): New members ftruncate
        and truncate.
gdb:
sim/common:
        * callback.c (os_ftruncate, os_truncate): New functions.
        (default_callback): Initialize ftruncate and truncate members.
sim/sh:
        * syscall.h (SYS_truncate, SYS_ftruncate): Define.
        * interp.c (trap): Add support for SYS_ftruncate and SYS_truncate.