* win32-nat.c: Perform various gcc warning cleanups.

* win32-nat.c: Perform various gcc warning cleanups.
(safe_symbol_file_add_cleanup): Reset stdout to saved stdout, not stderr.
(dll_symbol_command): Pass OBJF_USERLOADED to safe_symbol_file_add.
(get_child_debug_event): Always reset last_sig.  Always reset inferior pid
appropriately.
(do_initial_child_stuff): New function.  Called when attaching or starting a
new inferior process.
(child_attach): Use do_initial_child_stuff.
(child_create_inferior): Ditto.
* config/i386/cygwin.mh (NAT_FILE): Set to modern location.
* config/i386/tm-cygwin.h: Define ATTACH_NO_WAIT.