GIT_SILENT: Port away from ECMSetupVersion's deprecated *_VERSION_STRING CMake variable

2 jobs for master in 3 minutes and 24 seconds (queued for 316 minutes and 26 seconds)
Status Job ID Name Coverage
  Build
passed #104662
build_clazy_clang_tidy

00:01:56

passed #104661
linux kf5-qt5 qt5.15

00:01:28

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