GIT_SILENT: use c++17 as in the future we will depend against ecm which depend on it

2 jobs for master in 9 minutes and 28 seconds (queued for 16 minutes and 42 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #100045

00:05:10

passed linux kf5-qt5 qt5.15 #100044

00:04:18

22.0%