clif-util: Use anyhow::Error for errors instead of String

Also does the same for `cranelift-filetests`.

cranelift/Cargo.toml

@@ -35,7 +35,7 @@ log = "0.4.8"
 term = "0.6.1"
 capstone = { version = "0.6.0", optional = true }
 wat = { version = "1.0.18", optional = true }
-target-lexicon = "0.10"
+target-lexicon = { version = "0.10", features = ["std"] }
 peepmatic-souper = { path = "./peepmatic/crates/souper", version = "0.66.0", optional = true }
 pretty_env_logger = "0.4.0"
 rayon = { version = "1", optional = true }
@@ -43,6 +43,7 @@ file-per-thread-logger = "0.1.2"
 indicatif = "0.13.0"
 thiserror = "1.0.15"
 walkdir = "2.2"
+anyhow = "1.0.32"
 
 [features]
 default = ["disas", "wasm", "cranelift-codegen/all-arch", "peepmatic-souper", "souper-harvest"]