Merge #37: Fix fuzzing

7372460 Fix fuzzing (Christian Lewe)

Pull request description:

  Drops honggfuzz dependency `arbitrary` to meet MSRV. `arbitrary` 1.1.3 introduced `array_from_fn`, which is stable from Rust 1.63.0.

  See [https://github.com/lightningdevkit/rust-lightning/pull/1687](https://github.com/lightningdevkit/rust-lightning/pull/1687).

ACKs for top commit:
  apoelstra:
    ACK 7372460

Tree-SHA512: 4d3d5afa6f2e7ce101a93ff07b3d77d9df494eed1aae2cb17deca23b7a5cbea665f1cdda86c9b1b06e727a7d1ad670ae999c86fa44420fac5f1f5ff1d0aefb0a

Author: uncomputable

fuzz/Cargo.toml

@@ -11,7 +11,7 @@ cargo-fuzz = true
 honggfuzz_fuzz = ["honggfuzz"]
 
 [dependencies]
-honggfuzz = { version = "0.5", optional = true }
+honggfuzz = { version = "0.5", optional = true, default-features = false }
 simplicity = { path = ".." }
 
 # Prevent this from interfering with workspaces

fuzz/travis-fuzz.sh

@@ -9,7 +9,7 @@ if [ ${incorrectFilenames} -gt 0 ]; then
 fi
 
 # Testing
-cargo install --force honggfuzz
+cargo install --force honggfuzz --no-default-features
 for TARGET in fuzz_targets/*; do
 	FILENAME=$(basename $TARGET)
 	FILE="${FILENAME%.*}"