[PATCH] Add gdb remote protocol handling to strace

[Stan Cox]

This is the latest version of the gdbserver backend patch.  It is
rebased to master, supports the new event dispatch scheme,and has
changes including buffer handling improvements and a rewrite of
notification queue handling.   It is a large patch but much of it is
boilerplate changes due to adding the backend struct.  The branch is
located at:
  https://github.com/stanfordcox/strace

-configure*: configure support

-defs.h:  move enum trace_event here
  struct backend:  backend dispatch table.   All of the gdbserver
  version of these routines are independent and self contained except
  for get_regs which needs access to the register structures
  Any change not mentioned is only a change to allow for calling via a
  backend routine

-strace.c
  alloctcb and droptcb are accessed from the gdbs backend.
   handle_arg, end_init, final_cleanup, verify_args, start_init are
   generic default versions of backend methods.
  Add 'G' option to indicate how to connect to gdbs backend
  start_init invokes gdbserver, startup_child, startup_attach (via
  attach_tcb) start or connect to the child,
-syscall.c
  invoke backend.get_regs, which needs to access the iovec.  gdbserver
  does not require a separate routine to get the syscall number.
-gdbrsp.test
  New test

-gdbserver.c
  the gdbserver of the backend methods are defined here.  Communicates
  with gdbserver via the gdb remote protocol and converts to the
  packets that strace expects.  gdbserver has a syscall mode that
  returns information on syscalls via stop packets.  gdbserver has two
  protocol modes, all stop and non stop; both are supported.
-protocol.c
  support routines: gdb remote packets are deciphered here
-protocol.h
-signals.def
-signals.h
  gdb to native signal translation
-gdb_get_regs.c
  Gets the register set from gdbserver and converts to strace structures.
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