GIT_SILENT: switch to KDECompilerSettings + CMAKE_CXX_STANDARD already setted

CMakeLists.txt

@@ -10,8 +10,7 @@ set(CMAKE_MODULE_PATH ${mailcommon_SOURCE_DIR}/cmake/modules/ ${ECM_MODULE_PATH}
 
 include(KDEInstallDirs)
 include(KDECMakeSettings)
-set(KDE_COMPILERSETTINGS_LEVEL 5.85.0)
-include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
+include(KDECompilerSettings NO_POLICY_SCOPE)
 
 include(GenerateExportHeader)
 include(ECMGenerateHeaders)
@@ -100,8 +99,6 @@ endif()
 
 add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x050f00)
 add_definitions(-DKF_DISABLE_DEPRECATED_BEFORE_AND_AT=0x055600)
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 ########### CMake Config Files ###########
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5MailCommon")