D14112: Fix CMakeLists.txt to work with older versions of CMake

[Nathaniel Graham]

This revision was automatically updated to reflect the committed changes.
Closed by commit R134:d8ac72b45e97: Fix CMakeLists.txt to work with older versions of CMake (authored by ngraham).

REPOSITORY
  R134 Discover Software Store

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D14112?vs=37751&id=37878

REVISION DETAIL
  https://phabricator.kde.org/D14112

AFFECTED FILES
  libdiscover/backends/PackageKitBackend/CMakeLists.txt

To: ngraham, apol, #discover_software_store
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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