trace examples broken in master

[Julian Graham]

Hi Guilers,

I went to try out some of the traps / tracing features in the debugger
last night, and I ran into some compilation issues with `(ice-9
debugging ice-9-debugger-extensions)'.  A patch that resolves them is
attached -- I haven't pushed because I'm not sure I fully understand
the broader context of the code (e.g., why are we checking the version
when the debugger is now part of Guile itself?), and because I'm still
a little git-shy.

More importantly, though, tracing (as per the examples in section
5.21.3.5 of the manual) doesn't seem to produce any output.  Not sure
where to look to figure that out.


Regards,
Julian

0001-Fix-compilation-issue-in-ice-9-debugger-extensions.patch
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