Comment out emit of CT_/MT_ externs
Comment out emit of CT_/MT_ externs

The CT_ and MT_ functions are already available as exports due to being
in a header-style comment and being picked up there.  Defining them
again is duplication.

hostilefork/rebol,draegtun/ren-c,codebybrett/ren-c,draegtun/ren-c,draegtun/ren-c,hostilefork/rebol,codebybrett/ren-c,codebybrett/ren-c,mbk/ren-c,kealist/ren-c,mbk/ren-c,draegtun/ren-c,giuliolunati/ren-c,codebybrett/ren-c,giuliolunati/ren-c,kealist/ren-c,draegtun/ren-c,codebybrett/ren-c,hostilefork/rebol,rgchris/ren-c,kealist/ren-c,giuliolunati/ren-c,rgchris/ren-c,giuliolunati/ren-c,kealist/ren-c,kealist/ren-c,mbk/ren-c,hostilefork/rebol,rgchris/ren-c,rgchris/ren-c,hostilefork/rebol,kealist/ren-c,hostilefork/rebol,giuliolunati/ren-c,codebybrett/ren-c,mbk/ren-c,draegtun/ren-c,rgchris/ren-c