* child_info.h (CURR_CHILD_INFO_MAGIC): Update.
(child_info_fork::alloc_stack): Move into this class.
(child_info_fork::alloc_stack_hard_way): Ditto.
* dcrt0.cc (child_info_fork::alloc_stack): Ditto.
(child_info_fork::alloc_stack_hard_way): Ditto.
(_dll_crt0): Reference alloc_stack via fork_info.