[issue8036] Interpreter crashes on invalid arg to spawnl on Windows

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

2.6 and 3.0.1 used to disable the Microsoft CRT argument error handler: they return EINVAL, but newer versions don't, and should check their arguments before calling _spawnv.

FWIW, the checks are::
    pathname != NULL
    *pathname != '\0'
    argv != NULL
    *argv != NULL
    **argv != '\0'
The first and third checks are guaranteed by the implementation, but the other three should be done in posix_spawnv().
And the other calls to the various nt.spawn* functions probably suffer the same problem.

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nosy: +amaury.forgeotdarc

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