listerrors fails

[Kornel Benko]

Our python script lib/scripts/listerrors fails with the message
  File "./listerrors", line 25
    from __future__ import print_function
    ^
SyntaxError: from __future__ imports must occur at the beginning of the file
Exit 1

Since we require python3 here, this line is not needed IMHO

Removing this line, and using on the make-log I get
Traceback (most recent call last):
  File "lib/scripts/listerrors", line 162, in <module>
    main()
  File "lib/scripts/listerrors", line 70, in main
    if predicate(line): break
  File "lib/scripts/listerrors", line 77, in noweb_try
    if string.find(line, ": unescaped << in documentation chunk") != -1:
AttributeError: module 'string' has no attribute 'find'

(master & branch 2.3.x)

	Kornel
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