ldconfig: only configure compat32 when kernel supports it

[kib]

Summary

This depends on D42641. The patch eliminates hard-coded list of arches.

[kib]

Use compat_freebsd32 name

[markj]

I'd consider using the old name (i.e., compat_freebsd_32bit), just to be a bit friendlier to older kernels even though that's not supported.

libexec/rc/rc.d/ldconfig

42

[kib]

In D42669#973713, @markj wrote:

I'd consider using the old name (i.e., compat_freebsd_32bit), just to be a bit friendlier to older kernels even though that's not supported.

If old kernel is used, the consequence is only a stray error message about unknown ELF brand. IMO it is not worth leaving the old name around in script, esp. if it is removed some day.

[kib]

So you insist on using the old feature name?

[markj]

In D42669#974121, @kib wrote:

So you insist on using the old feature name?

I don't, it was a misclick.