print, writeln etc. fail when calling from C program on Win32

I'm getting caught out at the moment by having any PL clauses that make any
output-related side-effect calls such as print or writeln fail when calling
them from my C wrapper on Win32, meaning that the predicate itself fails
even though I have no interest in the print output in this context (but I
want to see the output when submitting queries from the SWI repl). I was
trying to work out if there was a simple way of allowing the print/write
calls to succeed (in terms of returning true) even if no output was ever
delivered anywhere. I had a look at the documentation on the SWI knowledge
base but I found that section a bit sketchy and couldn't glean meaningful
answers from it.
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