* fhandler_process.cc (win_heap_info::~win_heap_info): Only try to free
	heap_vm_chunks if it's not NULL.
	* pinfo.h (struct commune_result): Change type of n to DWORD.
	* pinfo.cc (_pinfo::commune_request): Change type of n to DWORD to
	fix subsequent sizeof test after reading from commune pipe on x86_64.
	Raise read timeout to match write timeout.
	* cygwin.sc.in (.rdata): Add .rdata_cygwin_nocopy subsection.
	(.cygheap): Raise size to 3 Megs on x86_64.
	* dcrt0.cc (dll_crt0_0): Drop call to init_global_security.
	* dtable.cc (std_consts): Drop NO_COPY.
	* errno.cc (errmap): Drop NO_COPY, constify instead.
	(_sys_errlist): Drop NO_COPY.
	* fhandler_clipboard.cc (CYGWIN_NATIVE): Ditto.
	* fhandler_console.cc (keytable): Drop NO_COPY, constify instead.
	* grp.cc (null_ptr): Make NO_COPY_RO.
	* heap.cc (eval_start_address): Fix comment.
	* localtime.cc (wildabbr): Make NO_COPY_RO.
	(gmt): Ditto.
	* miscfuncs.cc (case_folded_lower): Drop NO_COPY.
	(case_folded_upper): Ditto.
	(isalpha_array): Ditto.
	(nice_to_winprio): Ditto for priority.
	(class thread_allocator): New class to allocate thread stack on x86_64.
	(thr_alloc): Define global NO_COPY instant of thread_allocator.
	(CygwinCreateThread): Call thr_alloc.alloc on x86_64 to reserve stack.
	* net.cc (errmap): Drop NO_COPY, constify instead.
	(host_errmap): Ditto.
	* netdb.cc (SPACE): Drop NO_COPY.
	* sec_helper.cc (null_sdp): Static NO_COPY_RO definition of null SD.
	(sec_none): Define NO_COPY_RO, define content statically.
	(sec_none_nih): Ditto.
	(sec_all): Ditto.
	(sec_all_nih): Ditto.
	(get_null_sd): Remove.
	(init_global_security): Remove.
	* security.cc (file_mapping): Define NO_COPY_RO.
	(check_registry_access): Ditto for reg_mapping.
	* spawn.cc (exe_suffixes): Drop NO_COPY, constify instead.
	(dll_suffixes): Drop unused, disabled definition and comment.
	* strsig.cc (sys_sigabbrev): Drop NO_COPY_INIT.
	(sys_siglist): Ditto.
	* syscalls.cc (def_shells): Drop NO_COPY.
	* winsup.h (NO_COPY_RO): Define to place variable in
	.rdata_cygwin_nocopy section.
	(init_global_security): Drop declaration.