libdtrace: embed kernel bootfile in dtrace_hdl_t

[markj]

cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c

1320

Let's make the fallback value "/boot/kernel/kernel" rather than "kernel". The code below won't notice the difference, and that's better for other consumers which might expect an absolute path.

[christos]

Since D38825 doesn't need this patch anymore, is this needed?

[markj]

In D38892#893746, @christos wrote:

Since D38825 doesn't need this patch anymore, is this needed?

I think we can drop this one, indeed.