D21220: [Touchpad KCM] Fix libinput-less build and warnings

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: Plasma.
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REVISION SUMMARY
  If the X.Org libinput dev packages are not found, do not
  build the X11 libinput backend. This way the build succeeds.
  
  Fix also some minor warnings.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  touchpadLibinputFixes

REVISION DETAIL
  https://phabricator.kde.org/D21220

AFFECTED FILES
  CMakeLists.txt
  config-X11.h.cmake
  kcms/touchpad/src/backends/libinputcommon.h
  kcms/touchpad/src/backends/x11.cmake
  kcms/touchpad/src/backends/x11/libinputtouchpad.cpp
  kcms/touchpad/src/backends/x11/xlibbackend.cpp

To: romangg, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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