D18947: Bring FindUDev.cmake up to ECM standards

[Volker Krause]

vkrause added a reviewer: Build System.

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D18947

To: vkrause, #build_system
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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