build: remove fuzz target from workspace

[domodwyer]

Removes the fuzz target from the workspace, this fixes #174.

This is actually the default setup when you cargo fuzz init:

[package]
name = "blah-fuzz"
version = "0.0.0"
authors = ["Automatically generated"]
publish = false
edition = "2018"

[package.metadata]
cargo-fuzz = true

[dependencies]
libfuzzer-sys = "0.4"

[dependencies.blah]
path = ".."

# Prevent this from interfering with workspaces
[workspace]
members = ["."]

[[bin]]
name = "fuzz_target_1"
path = "fuzz_targets/fuzz_target_1.rs"
test = false
doc = false

Running cargo fuzz ... still works as usual, and that's what CI does so this should not cause any problems.

---

• build: remove fuzz target from workspace (9b85cb2)

  This prevents the fuzz target from being run accidentally / run when compiled
  without instrumentation.
  

[crepererum]

This now excludes the fuzz target from all other workspace-wide actions (fmt, clippy, docs) just because cargo test --workspace --bins is broken. To me this seems like the wrong fix.

[crepererum]

Ref rust-lang/cargo#8338