This partially reverts commit d4920360bffddaa5923a8da0b15f3ad9a2a97e78.
Windows does support environment blocks of unlimited sizes, which makes the reverted commit a workaround for (at least) one defective application. And it's a very invasive workaround: there are multiple applications that run on Wine, but expect the user to supply environment variables from the Unix side (e.g. DXVK). The change breaks these configurations on users who may not even use the defective application(s).
So, instead of breaking configurations, just warn the user that there may be issues due to the large environment block.
-- v3: ntdll: Warn when environment block is too large, instead of removing it