D23884: Fix KListOpenFilesJob unit test on Unix if lsof is not installed

[David Hallas]

hallas added inline comments.

INLINE COMMENTS

> dhaumann wrote in klistopenfilesjobtest_unix.cpp:34
> Can't you simply use QStandardPaths::findExecutable()?
> 
> https://doc.qt.io/qt-5/qstandardpaths.html#findExecutable

Yes, this seems to do exactly what we need :)

> ngraham wrote in klistopenfilesjobtest_unix.cpp:37
> A prior career in build engineering tells me that this will start failing in 10 years when `lsof` removes the `-v` argument and replaces it with `--version`. For robustness' sake, I would additionally check for `--version` (and possibly even `-version` too) if the initial `lsof -v` call fails.

I have changed the code to use QStandardPaths::findExecutable instead

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D23884

To: hallas, dfaure
Cc: dhaumann, ngraham, kde-frameworks-devel, LeGast00n, GB_2, michaelh, bruns
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