third-party: enable signal feature in crate nix

Summary: This only seems to affect how autocargo works -- it is usable already through Buck.

Reviewed By: manav-a, dtolnay

Differential Revision: D68734129

fbshipit-source-id: c49432f3eab2a89ca786c8b5d981970f0bed6c7b

watchman/cli/Cargo.toml

@@ -22,13 +22,13 @@ tokio = { version = "1.41.0", features = ["full", "test-util", "tracing"] }
 watchman_client = { version = "0.9.0", path = "../rust/watchman_client" }
 
 [target.'cfg(target_os = "linux")'.dependencies]
-nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "signal", "term", "time", "user", "zerocopy"] }
 
 [target.'cfg(target_os = "macos")'.dependencies]
-nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "signal", "term", "time", "user", "zerocopy"] }
 
 [target.'cfg(unix)'.dependencies]
-nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "signal", "term", "time", "user", "zerocopy"] }
 
 [features]
 default = []