D14003: Require out-of-source build

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: dfaure, cfeck, Frameworks.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  KService doesn't build if you try to do an in-source build (`fakeplugin.desktop` gets renamed in the wrong place and CMake dies), so let's just require an out-of-source build, which people should be doing anyway.

TEST PLAN
  - Builds with an out-of-source build
  - Stops immediately if you try to do an in-source build

REPOSITORY
  R309 KService

BRANCH
  require-in-source-build (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D14003

AFFECTED FILES
  CMakeLists.txt

To: ngraham, dfaure, cfeck, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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