[continuous-integration] add macOS build config with clang compiler (#4931)
[continuous-integration] add macOS build config with clang compiler (#4931)

openthread/openthread,chshu/openthread,srickardti/openthread,chshu/openthread,srickardti/openthread,bukepo/openthread,openthread/openthread,lanyuwen/openthread,chshu/openthread,openthread/openthread,chshu/openthread,abtink/openthread,librasungirl/openthread,lanyuwen/openthread,abtink/openthread,bukepo/openthread,librasungirl/openthread,librasungirl/openthread,lanyuwen/openthread,openthread/openthread,jwhui/openthread,chshu/openthread,jwhui/openthread,bukepo/openthread,jwhui/openthread,chshu/openthread,srickardti/openthread,lanyuwen/openthread,abtink/openthread,librasungirl/openthread,bukepo/openthread,abtink/openthread,lanyuwen/openthread,jwhui/openthread,srickardti/openthread,lanyuwen/openthread