Cargo.toml: add "iterator" feature to signal-hook

This dependency is necessary, though for some reason the build doesn't
always fail if it's not specified.

Signed-off-by: Manos Pitsidianakis <manos@pitsidianak.is>

meli/Cargo.toml

@@ -45,7 +45,7 @@ pcre2 = { version = "0.2.3", optional = true }
 serde = "1.0.71"
 serde_derive = "1.0.71"
 serde_json = "1.0"
-signal-hook = { version = "^0.3", default-features = false }
+signal-hook = { version = "^0.3", default-features = false, features = ["iterator"] }
 signal-hook-registry = { version = "1.2.0", default-features = false }
 smallvec = { version = "^1.5.0", features = ["serde"] }
 structopt = { version = "0.3.14", default-features = false }

tools/Cargo.toml

@@ -41,7 +41,7 @@ crossbeam = { version = "^0.8" }
 meli = { version = "0.7" }
 melib = { version = "0.7", features = ["debug-tracing", "unicode-algorithms"] }
 nix = { version = "^0.24", default-features = false }
-signal-hook = { version = "^0.3", default-features = false }
+signal-hook = { version = "^0.3", default-features = false, features = ["iterator"] }
 signal-hook-registry = { version = "1.2.0", default-features = false }
 
 [features]