Adapt some tests for OpenBSD: - scrollback_spec: - seq(1) is not available on OpenBSD: we'd use jot(1). - Instead use a (hopefully) portable awk(1) snippet. - channels_spec - job_spec - tui_spec
- Test_libcall_libcallnr: pass libc name to dlopen.
Does only the build step for now, some tests fail currently.