D9781: do not incorrectly split spaces in paths of duplicate results

[Harald Sitter]

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REVISION SUMMARY
  use kcoreaddons to split fdupes output. fdupes outputs
  `/space\ inbetween/x.svg /space\ inbetween/y.svg`
  as dupe result, which, if we split blindly for space, we'll split into 4
  pieces instead of 2.
  splitting the argument string using escape rules via kshell gives us
  correct splitting by taking into account the escaped spaces.
  
  unfortunately qregex doesn't seem to support negative lookbehind
  expressions, or we could solve this with a `(?<!\\\\)` instead of having
  to use kshell.

TEST PLAN
  test output is lovely again

REPOSITORY
  R266 Breeze Icons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9781

AFFECTED FILES
  autotests/CMakeLists.txt
  autotests/dupetest.cpp

To: sitter, dfaure
Cc: #frameworks
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