Only if the implementation details (aside from what is dictated by the spec) of strlcpy meets the originality threshold of a copyrightable work, no?

edit: Also depends on the jurisdiction, http://en.wikipedia.org/wiki/Threshold_of_originality#Exampl... - and you don't necessarily have to change your own license, a valid resolution is also to stop distributing versions of your program that incorporate GPL'd code.