[CM] Snd 18.4

[bil at ccrma.Stanford.EDU]

Snd 18.4:

s7: s7_c_object_type_set* various changes

clm: added (clm-initialize-links) at end of all.lisp

Koen De Turck provided openBSD audio support using sndio

checked: sbcl 1.4.7, FC 28 (gcc 8.0), Ubuntu 18.04, openbsd 6.3

Thanks!: Kjetil Matheussen, Michael Edwards, Koen De Turck.