D7784: CMake 3.1 is the actually required version

[Heiko Becker]

heikobecker created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  CXX_STANDARD is only available since 3.1.
  $ git show 913394af2: cmTarget: Add CXX_STANDARD and CXX_EXTENSION...
  $ git tag --contains 205215fb8 | head -n: v3.1.0
  
  3.1 also has CMakePackageConfigHelpers (available since 3.0),
  allowing to drop ECMPackageConfigHelpers (it actually fixes a CMake
  warning when requiring >=3.0).
  
  Furthermore move cmake_minimum_required(VERSION 3.1 FATAL_ERROR) to
  the top of CMakeLists.txt like suggested by CMake's documentation.

TEST PLAN
  cmake .. & ninja

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7784

AFFECTED FILES
  CMakeLists.txt

To: heikobecker, #kwin, #plasma
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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