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52c31d32e8
Using `userenv!CreateEnvironmentBlock()` when starting the shell ensures
that, even if it's started as LocalSystem, its environment inherits the
"dynamical" environment variables created by SMSS at runtime (stored in
`HKLM\SYSTEM\CurrentControlSet\Session Manager\Environment`).
In ReactOS/Windows PE "MiniNT" mode, the Winlogon environment doesn't
contain these values, and doesn't start the Setup with this augmented
environment. (This is compatible with what Windows does, on WinPE or
during a clean installation.)
Winlogon creates an augmented environment only when a user logs in and
starts its shell (standard boot), which isn't the case in "MiniNT" mode.
It is thus the responsibility of the module that starts the shell instead
to do it: in ReactOS' case, userinit.exe in LiveCD mode.
As a result, we get access to the `COMPUTERNAME`, `NUMBER_OF_PROCESSORS`,
`OS`, and `PROCESSOR_*` environment variables, amongst others.
This is a cherry-pick of eec8c97708.