D20230: Allow building without UDev on Linux

[Aleix Pol Gonzalez]

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REVISION SUMMARY
  Flatpak has been patching this for a while, there doesn't seem to be a way to
  use it there, so we better offer the option upstream.

TEST PLAN
  Been building and using solid on flatpak runtimes for a while.

REPOSITORY
  R245 Solid

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20230

AFFECTED FILES
  CMakeLists.txt

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