* ntdll.h (STATUS_NETWORK_OPEN_RESTRICTION): Define.
	(STATUS_SYMLINK_CLASS_DISABLED): Define.
	* path.cc (symlink_info::check): Handle STATUS_NETWORK_OPEN_RESTRICTION
	and STATUS_SYMLINK_CLASS_DISABLED status codes.  Explain why.
	* libc/include/sys/features.h: Redefine compilation environment
	definitions for Cygwin to cover 64 bit Cygwin.
	* sysconf.cc (sca): Change build environment values according to
	architecture.
	(csa): Ditto.
	* net.cc (struct win64_servent): Define for x86_64.  Explain why.
	(WIN_SERVENT): Define for all targets.
	(dup_ent): Use WIN_SERVENT to access critical servent members
	throughout.
	* net.cc (cygwin_gethostbyname): Revert accidental checkin of change
	added for debugging.
	* fhandler_console.cc
	(fhandler_console::create_invisible_console_workaround): Fix comment.
	* wincap.cc: Throughout, remove unused has_console_handle_problem
	wincapc members.
	* wincap.h (struct wincaps): Remove has_console_handle_problem.