/usr/share/syslog-ng/include/scl/ is in syslog-ng-mod-extra 3.13.2-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/syslog-ng/include/scl/default-network-drivers/
/usr/share/syslog-ng/include/scl/default-network-drivers/plugin.conf
/usr/share/syslog-ng/include/scl/ewmm/
/usr/share/syslog-ng/include/scl/ewmm/ewmm.conf
/usr/share/syslog-ng/include/scl/graylog2/
/usr/share/syslog-ng/include/scl/graylog2/plugin.conf
/usr/share/syslog-ng/include/scl/loadbalancer/
/usr/share/syslog-ng/include/scl/loadbalancer/gen-loadbalancer.sh
/usr/share/syslog-ng/include/scl/loadbalancer/plugin.conf
/usr/share/syslog-ng/include/scl/osquery/
/usr/share/syslog-ng/include/scl/osquery/plugin.conf
/usr/share/syslog-ng/include/scl/windowseventlog/
/usr/share/syslog-ng/include/scl/windowseventlog/plugin.conf
/usr/share/syslog-ng/include/scl/windowseventlog/windowseventlog.xml