Fuzzing patch

[Jacob Hoffman-Andrews]

> Thank you for the patch, I put it in the contrib/ directory in the
> source tree.  Where people can apply it to compile the unbound-fuzzme
> program for fuzzing.  But it is not included in the main codeline, since
> most distros do not need to ship it to normal users.
Excellent, thanks. I'll proceed with submitting it to OSS-Fuzz.

In reading the OSS-Fuzz instructions, I noticed they recommend that the 
fuzzing binary be built and run regularly as part of "make test." If I 
refactored this to be part of "make test," would you accept it as part 
of the main codeline?