D20105: ecm_add_wayland_client_protocol: Improve error messages

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: KWin, Frameworks.
Herald added projects: Frameworks, Build System.
Herald added subscribers: kde-buildsystem, kde-frameworks-devel.
apol requested review of this revision.

REVISION SUMMARY
  Instead of passing the data from stdin, pass the path, this way if there's an error wayland-scanner will be able to tell us the file and line where it's failing.

TEST PLAN
  Built kwayland and kwin with it

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20105

AFFECTED FILES
  find-modules/FindWaylandScanner.cmake

To: apol, #kwin, #frameworks
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns
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