diag: add VERB_ERR (to be verified)
This introduces "-DDIAG_ERR" at build time and pp_error() as a
conditionally-compiled and conditionally-enabled thing. I'm not sure
error messages should be missing from the binary by default, but I'll
evaluate better at a later time, after debugging my own errors.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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