IO Warning Fixes

[Richard Laager]

I'm pushing a number of fixes from ticket #1344 from o_sukhodolsky.
These should be okay. At a minimum, this should get us logging of these
errors (if they occur). That said, I haven't done much testing here, so
if things blow up, please feel free to revert them.

I would be especially grateful if someone running Zephyr could make sure
I haven't blown things up for them.

As a side note, I also killed the printing of the DBus "Functions not
exported", so it's easier to actually see compiler warnings now.

Richard
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