D8979: ecm_add_test: Use proper path sep on Windows

[David Faure]

dfaure accepted this revision.
dfaure added a comment.
This revision is now accepted and ready to land.


  Ah, oops, indeed.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8979

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