parallel make bug in tune/ directory

[Torbjörn Granlund]

Vincent Lefevre <vincent at vinc17.net> writes:

  Attached. Before this change, "make tune" was failing (I don't have
  to specify -j explicitly since this is the default config on my
  machines, hence the particular importance of .NOTPARALLEL). After
  this change, "make tune" runs sequentially and I don't get a build
  failure for tune ("make tune" failed with an abort just because
  "speed_measure() could not get 4 results within 1.0%" I assume).

Thanks! (Applied by Marco.)

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Torbjörn
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