Introduce the

	void backtrace(void);
function which will print a backtrace if DDB is in the kernel and an
explanation if not.

This is useful for recording backtraces in non-fatal circumstances and
does not require pollution with DDB #includes in the files where it
is used.

It would of course be nice to have a non-DDB dependent version too,
but since the meat of a backtrace is MD it is probably not worth it.

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