* dcrt0.cc (getstack): New function.

(alloc_stack): Use tls stuff for stack info rather than calling VirtualQuery.
(dll_crt0_0): Initialize _impure_ptr stuff much earlier.  Move
init_console_handler here.
* fork.cc (class frok): New class renamed from local fork() struct.
(stack_base): Change argument type.  Use tls stuff to determine stack info
rather than calling VirtualQuery.
(frok::child): Rename from fork_child.  Eliminate now unneeded arguments.
(frok::parent): Rename from fork_parent and ditto.  Set error and errno as
appropriate.  Fixup impersonation in cleanup, if needed.  Try harder to set
errno appropriately.
(fork): Define "grouped" as a frok type.  Deal with errors from fork_parent
here.
* init.cc (dll_entry): Remove init_console_handler call.

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