Fix nptl/tst-cancel7 for non-bash shells

[Andreas Schwab]

Jonathan Nieder <jrnieder@gmail.com> writes:

> But it is not safe to rely on its presence or its absence.  Whether
> the shell can avoid these forks is not a POSIX conformance issue.

Even in bash it is configurable.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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