Created xidepend mechanism
.
	* dcrt0.cc (child_info_fork::alloc_stack_hard_way): Fix datatype of
	stacksize to SIZE_T.  Cast to SIZE_T in pointer arithmetic.  Slightly
	enhance output in case of a fatal error.
	* fork.cc (frok::parent): Always set ch.stackaddr to DeallocationStack
	value of current thread to help stack reservation in
	child_info_fork::alloc_stack_hard_way along.  Simplify subsequent code
	storing stack values in ch.  Print guardsize in hex, too.
	* fork.cc (frok::parent): Call CreateProcessW with command line set
	to the parent command line.  Change comment to explain why.
	* fork.cc (frok::parent): Always set CREATE_UNICODE_ENVIRONMENT flag.
	Explain why.