D8660: ECMAddTests: set QT_PLUGIN_PATH so locally built plugins can be found

[David Faure]

dfaure created this revision.
dfaure added reviewers: cgiboudeaux, kfunk.
Restricted Application added projects: Frameworks, Build System.

REVISION SUMMARY
  This of course requires running the unittests via ctest rather than
  launching the executable directly.

TEST PLAN
  `ctest -V -R kurifiltertest` in kio, which prints QCoreApplication::libraryPaths() at the beginning of the test.
  With this commit, builddir/kio/bin is added at the front of the list, and the kurifilter plugins from kio's build are loaded.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D8660

AFFECTED FILES
  CMakeLists.txt

To: dfaure, cgiboudeaux, kfunk
Cc: #frameworks, #build_system
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