[Bug 45320] cmd creates an environment variable with an empty name

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=45320

--- Comment #7 from Dima Ryazanov <dima at gmail.com> ---
Looks like Python is using _wenviron:
https://github.com/python/cpython/blob/master/Modules/posixmodule.c#L1395

I've attached two test files:
env.c: prints out the contents of _wenviron
test.c: runs env.exe with a custom environment: X=x, Y=y, and =%FOO=bar.

On Wine, I see this:

X=x
=%FOO=bar
Y=y
ProgramW6432=C:\Program Files
ProgramFiles=C:\Program Files
CommonProgramW6432=C:\Program Files\Common Files
CommonProgramFiles=C:\Program Files\Common Files

On Windows 10, I only see:

X=x
Y=y

If instead of _wenviron I use GetEnvironmentStrings, then the Wine output stays
the same, but on Windows 10, I see:

X=x
=%FOO=bar
Y=y

So yeah, the =% variables just get filtered out.

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