[autotools] Fixed fuzzer build
Summary: autotools fuzzer build was broken, this fixes it
Test Plan:
./configure --enable-fuzz --with-sanitizers=fuzzer,address --disable-wallet --disable-bench --with-utils=no --with-daemon=no --with-libs=no --with-gui=no --with-seeder=no --enable-deprecated-build-system --without-miniupnpc --disable-zmq make ./test/fuzz/test_runner.py -l DEBUG ~/dev/qa-assets/fuzz_seed_corpus
Reviewers: #bitcoin_abc, jasonbcox
Reviewed By: #bitcoin_abc, jasonbcox
Differential Revision: https://reviews.bitcoinabc.org/D7143