* Allows us to use dladdr on FC6, where previous test failed because
we expected an exact match on the name for "printf", whereas the
name we got is "_IO_printf".
IIRC the reason for the name was that some marginal platform had a
dladdr that always returned "unknown function" or something like
that -- here's hoping that's not the case anymore, but if it is,
testing that the return value is not a placeholder string like that
is probably better.