xrandr 1.5.2

Alan Coopersmith requested to merge alanc/xrandr:release into master
  • gitlab CI: add a basic build test
  • Fix spelling/wording issues
  • gitlab CI: stop requiring Signed-off-by in commits
  • Variable scope reductions as suggested by cppcheck
  • Fix a -Wsign-compare warning
  • Remove unused macros left over from original RandR 1.2 code
  • Remove unused definition of rectangle_t
  • Constify array argument to find_last_non_clamped()

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