[fix] include stdio header in readline C code in example so it builds on all systems #3378
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Closes #1179.
Description
On some systems this sample already builds fine, on others it hits the error that
FILEis not defined. Includingstdiofixes the problem and even aligns with the example code given in the readline manpages.Should this change go in the CHANGELOG?
implementation, I have updated
CHANGELOG_NEXT.md(and potentially alsoCONTRIBUTORS.md).