bug#13832: Tests fail because make runs with more than one jobs

[Stefano Lattarini]

Reference:
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13832>

Hi Joshua, sorry again for the shameful delay.

Can you check whether the attached patch solves the failure you've been
experiencing with the test 't/ar-lib4.sh'?  (as for the other failure
in 't/objc-megademo.sh', I still have no idea what might be causing
it -- some strange regression in automake? a libtool bug? puzzled ...)

Thanks,
  Stefano

0001-tests-avoid-possible-autotools-caching-issues-automa.patch
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