Retpolines now enabled by default in clang on #OpenBSD amd64.

https://marc.info/?l=openbsd-cvs&m=154621129329314&w=2

(It was previously enabled for the kernel, including handwritten assembly)

https://www.mail-archive.com/source-change[email protected]/msg97849.html
https://marc.info/?l=openbsd-cvs&m=152834458329715&w=2