Remove old extension entry declarations
Remove old extension entry declarations

These are out-of-date and conflicts with the ones defined in sys-ext.h

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