[docs] [issue15759] "make suspicious" doesn't display instructions in case of failure

[Ezio Melotti]

Ezio Melotti added the comment:

Serhiy, your patch LGTM.
Can you apply a similar fix for the linkcheck and doctest target and commit it?

FWIW the patch produces a slightly different output (in addition to showing the missing message), but I don't think it's a problem:
Without patch:
  ...
  build finished with problems, 8 warnings.
  make: *** [build] Error 1
With patch:
  ...
  build finished with problems, 8 warnings.
  make[1]: *** [build] Error 1
  make[1]: Leaving directory `/home/wolf/dev/py/py3k/Doc'
  Suspicious check complete; ...
  make: *** [suspicious] Error 1

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versions: +Python 3.5 -Python 3.3

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