Update.

Update.

	* pthread_create.c: Define __pthread_keys using nocommon
	attribute, not by placing it explicitly in bss.
	Remove DEFINE_DEALLOC definition.  Not needed anymore.

	* allocatestack.c: Define ARCH_MAP_FLAGS if not already defined.
	Use it in mmap call to allocate stacks.

	* sysdeps/pthread/createthread.c (create_thread): Fix comment.