cvs/fedora-glibc-20090427T1419

	to MAP_ANON in PROT_NONE mmap64 call.
	(open_archive): Likewise.
	(file_data_available_p): Use mmap64 instead of mremap.
	(enlarge_archive): Likewise.  Update head if ah->addr changed.
	Attempt to reserve address space after mmap64 region.