* config/nm-linux.h (struct objfile): Remove forward declaration.

* config/nm-linux.h (struct objfile): Remove forward declaration.
(linuxthreads_new_objfile): Remove prototype.
(linuxthreads_pid_to_str): Remove prototype.
(PREPARE_TO_PROCEED): Redefine in terms of
lin_lwp_prepare_to_proceed.
(struct target_waitstatus): Forward declaration.
(child_wait): New prototype.
(CHILD_WAIT): Define.
(lin_lwp_attach_lwp, ATTACH_LWP, lin_thread_get_thread_signals,
GET_THREAD_SIGNAL): Moved here from arch-specific files.
* config/alpha/nm-linux.h, config/arm/nm-linux.h,
config/ia64/nm-linux.h, config/mips/nm-linux.h,
config/powerpc/nm-linux.h: Don't include <signal.h>.
(lin_lwp_attach_lwp, ATTACH_LWP, lin_thread_get_thread_signals,
GET_THREAD_SIGNAL): Remove.
* config/i386/nm-linux.h: Likewise.
(struct target_waitstatus, child_wait, CHILD_WAIT): Remove.
* config/m68k/linux.mh, config/sparc/linux.mh (NATDEPFILES):
Remove linux-thread.o.  Add proc-service.o, thread-db.o and
lin-lwp.o.
(LOADLIBES): New variable.