Provide an interface for fuzzing sequence producer plugins

tests/fuzz/seq_prod_fuzz_example/Makefile

@@ -0,0 +1,16 @@
+# Copyright (c) Yann Collet, Meta Platforms, Inc.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# You may select, at your option, one of the above-listed licenses.
+
+CC = clang
+CFLAGS = -g -fno-omit-frame-pointer -fsanitize=undefined,address,fuzzer -I../ -I../../../lib/
+
+.PHONY: default
+default: example_seq_prod.o
+
+example_seq_prod.o: example_seq_prod.c
+	$(CC) -c $(CFLAGS) $^ -o $@