[Bug 213863] dns/unbound fails to build on arm64 (no sbrk)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213863

--- Comment #2 from Ed Maste <emaste at freebsd.org> ---
configure just compiles conftest.c containing sbrk() into conftest.o; it does
not link it

Running it manually,
% cc -c  -g -O2 -D_THREAD_SAFE -pthread -Werror conftest.c
% echo $?
0

But actually trying to link it,
% cc -g -O2 -D_THREAD_SAFE -pthread -Werror conftest.c
/tmp/ss-1109f6.o: In function `main':
/scratch/emaste/unbound/conftest.c:179: undefined reference to `sbrk'
/scratch/emaste/unbound/conftest.c:179: undefined reference to `sbrk'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
%

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