[issue6731] Add option of non-zero exit status of setup.py when building of extensions has failed

[Guilherme Polo]

Guilherme Polo <ggpolo at gmail.com> added the comment:

> If it's not a problem, then the invoker doesn't need to check the exit
> code of setup.py.

Suppose the _tkinter module failed to compile on a given system, how
would you know if this is a problem or not ? setup.py would return 1
because it couldn't be built, but the rest of Python were compiled
successfully.

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nosy: +gpolo

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