* config/i386/nm-cygwin.h (ATTACH_NO_WAIT): Delete.

	* config/i386/nm-cygwin.h (ATTACH_NO_WAIT): Delete.
	* config/i386/nm-i386gnu.h (ATTACH_NO_WAIT): Delete.

	* target.h (struct target_ops): Add to_attach_no_wait member.
	(target_attach_no_wait): New.
	* target.c (update_current_target): Inherit to_attach_no_wait.

	* infcmd.c: Replace ATTACH_NO_WAIT compile time check by
	target_attach_no_wait runtime check.

	* gnu-nat.c (init_gnu_ops): Set to_attach_no_wait in gnu_ops.
	* win32-nat.c (init_win32_ops): Set to_attach_no_wait in
	win32_ops.