New issue 3136: os.putenv crashes in case of errors (win32)
https://bitbucket.org/pypy/pypy/issues/3136/osputenv-crashes-in-case-of-errors-win32
Christoph Reiter:
```
import os
while 1:
os.putenv("==", "foo")
```
On Windows 10 using PyPy 3 7.3.0rc3: no exception raised, process crashes
On Windows 10 using CPython 3.8.1:
```
ValueError: illegal environment variable name
```
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