Initialize dh_ctx
Initialize dh_ctx

This avoids a crash by:
>> dh: dh-make-key
>> dh-generate-key dh

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