[Bug 48471] Mismatching behavior of GetEnvironmentVariableW for empty / long values

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48471

--- Comment #2 from Vladimir Panteleev  ---
Here is the result of running the above program on the Test Bot:
https://testbot.winehq.org/JobDetails.pl?Key=63451

Observations:
- Windows XP is the only one which returns an error when given an empty buffer
(which is what Wine does now).
- Windows XP and 2003 do not clear the buffer if the value does not fit.
- All other versions produce the same output (like the Windows 10 log in the
description above).