win32: changes to user ids

Formalise the use of 0 as the uid of a process running with elevated
privileges:

- Rewrite getuid(2) to return DEFAULT_UID by default and 0 if the
  process has elevated privileges.
- geteuid(2) and the corresponding functions for groups are aliases
  for getuid(2).
- Change root's home directory to be whatever GetSystemDirectory()
  returns, probably C:/Windows/System32 in most cases.
- Remove the special handling of geteuid(2) in the line editing code.

With these changes the shell started by 'su' is a lot more like a
*nix root shell.

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