Cleanup CODEOWNERS file (#2879)
Cleanup CODEOWNERS file (#2879)

* CODEOWNERS: let_syntax -> ocaml-syntax-shims
* CODEOWNERS: which_program does not exist anymore
* CODEOWNERS: configurator is in otherlibs
* CODEOWNERS: fix typo in emacs integration dir

Signed-off-by: Etienne Millon <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@emillon.org>

janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,dra27/jbuilder,dra27/jbuilder