* gdb_proc_service.h (struct ps_prochandle): Replace pid_t field

	* gdb_proc_service.h (struct ps_prochandle): Replace pid_t field
	with a ptid_t field.
	* linux-thread-db.c (thread_get_info_callback): Build the ptid
	using the pid stored in proc_handle.ptid.
	(thread_from_lwp, thread_db_attach_lwp, enable_thread_event)
	(check_for_thread_db, thread_db_detach, check_event)
	(thread_db_mourn_inferior, find_new_threads_callback)
	(thread_db_find_new_threads_1): Adjust.
	* proc-service.c (ps_xfer_memory, ps_lgetregs, ps_lsetregs)
	(ps_lgetfpregs, ps_lsetfpregs, ps_getpid): Adjust.