bug#13587: backward-compatible way of declaring serial tests?

[Andy Wingo]

Hi,

Guile has one meta-test runner that prints things on stdout as it goes.
It works well with serial-tests but parallel-tests hides the output,
which is not so nice.

Anyway we have added serial-tests to the options; fine.  However this
prevents Guile from autoreconfing with automake 1.11 (option
`serial-tests' not supported).  Is there a
backwards-and-forwards-compatible way of requesting serial tests?

Thanks,

Andy
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