Auto merge of #3628 - RalfJung:tokio, r=RalfJung

add back some tokio features

Turns out I went a bit too fer when I removed features, so `socketpair` was no longer used.

Author: bors

test_dependencies/Cargo.lock

@@ -18,7 +18,9 @@ getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }
 [target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dependencies]
 tempfile = "3"
 page_size = "0.6"
-tokio = { version = "1.24", features = ["macros", "rt-multi-thread", "time", "net"] }
+# Avoid pulling in all of tokio's dependencies.
+# However, without `net` and `signal`, tokio uses fewer relevant system APIs.
+tokio = { version = "1.24", features = ["macros", "rt-multi-thread", "time", "net", "fs", "sync", "signal"] }
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.52", features = [ "Win32_Foundation", "Win32_System_Threading" ] }