Mark devices with EXTERN_C
Mark devices with EXTERN_C

This is how the devices are defined by DEFINE_DEVICE, a change
introduced by f52f772c7329a18ad42ad11d1b9d3b348bd7b098 (Set_Stack_Limit
during PUSH_UNHALTABLE_TRAP)

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