* gdbserver/Makefile.in: Add dependancies on server.h.

	* gdbserver/Makefile.in:  Add dependancies on server.h.
	* gdbserver/remote-gutils.c:  Remove lots of unused functions and
	variables.
	* gdbserver/remote-inflow.c:  Remove lots of unused variables and
	#includes.  Also, use PTRACE_* symbols instead of constants.
	(mywait):  Surround calls to wait() with enable/disable_async_io()
	so that we can be interrupted from GDB while waiting for the
	child.  Also, handle child exit more gracefully.
	* gdbserver/remote-server.c:  Remove lots of unused variables.
	Move all extern defs into server.h.  Redo main loop so that
	failure from getpkt() causes communications to be re-established.
	Fix 'k' command so that it restarts the child.
	* gdbserver/remote-utils.c:  Remove lots of unloved vars and
	subrs.  Move many extern decls into server.h.  (remote_open):  For
	tcp, seperate usage of proto fd from connected fd.  Close proto
	fd after getting connection.  (putpkt/getpkt):  Pay attention to
	errors when reading/writing.  Report these to the caller.  New
	routines input_interrupt/enable_async_io/disable_async_io to make
	it possible to get an I/O interrupt when data arrives from the
	comm link.
	* serial.h:  New file to contain common defs for all remote files.