[issue3812] py3k build fails if configure --without-threads

[Amaury Forgeot d'Arc]

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

Agreed. I suggest that you add a comment like
"itertools.chain is in an extension module and may be unavailable"
just above.
Otherwise, someday one will find that this code should use a function
from the stdlib, and revert your change...

Please apply it.

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nosy: +amaury.forgeotdarc
resolution:  -> accepted

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