D18807: find volume feedback's runtime requirements

[Harald Sitter]

sitter created this revision.
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REVISION SUMMARY
  I'm in a good mood so there's even finders!
  
  - FindCanberra now also sets the version (this is necessary to hint directories for the pulse backend lookup)
  - new FindCanberraPulse attempts to find the canberra-pulse backend using manually constructed hinting (unfortunately canberra's pc doesn't define the dir so we'll basically have to guess)
  - new FindSoundThemeFreedesktop which locates the freedesktop sound theme we actually require for the notification sound (since we have no plasma sound theme :()
  
  The new finders are put to use to locate and indicate RUNTIME dependencies.
  As with all runtime deps, if the finders should proof unreliable
  CMAKE_DISABLE_FIND_PACKAGE_* can be used to easily silence the warnings.
  They may of course also be safely ignored.
  
  Getting canberra and the sound-theme dependency right has proven a
  challenge to distributions. The problem goes back even to when kde-runtime
  was still a thing and used canberra, and AFAIK wasn't even resolved by
  all distributions by the time plasma 5 came around and kde-runtime killed
  off. So, clearly we need to help things along a bit by properly codifying
  and communicating the requirements here.
  
  The volume feedback is effectively disabled when the pulse backend cannot
  be loaded, and the actual feedback sound is by default coming from the
  default xdg theme which also must be available for the feedback to work.

REPOSITORY
  R115 Plasma Audio Volume Applet

BRANCH
  runtime-deps

REVISION DETAIL
  https://phabricator.kde.org/D18807

AFFECTED FILES
  CMakeLists.txt
  cmake/FindCanberra.cmake
  cmake/FindCanberraPulse.cmake
  cmake/FindSoundThemeFreedesktop.cmake

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