Has it been replaced - with what?

Looks like setq-local can be used directly instead of org-set-local.

- http://orgmode.org/cgit.cgi/org-mode.git/commit/?id=bc0588fee4994eda9474e62313eb9925ad65dab1

- http://orgmode.org/cgit.cgi/org-mode.git/commit/?id=07e16c2fc5687de5e1761bbf4ba3cf1777de15eb