ENABLE(SUID_SANDBOX_LINUX) was only used by Qt port. Qt port was gone away, but left a cruft in Tools/Scripts/webkitperl/FeatureList.pm.
Created attachment 262771 [details] Patch
Comment on attachment 262771 [details] Patch Clearing flags on attachment: 262771 Committed r190805: <http://trac.webkit.org/changeset/190805>
All reviewed patches have been landed. Closing bug.