Rollup merge of rust-lang#64384 - mati865:tools_hack, r=alexcrichton

Trim rustc-workspace-hack

Those dependencies seem no longer necessary.
`./x.py test` and `x86_64-gnu-tools` container passed locally so I think this won't hurt.

Cargo.lock

@@ -3248,14 +3248,9 @@ dependencies = [
 name = "rustc-workspace-hack"
 version = "1.0.0"
 dependencies = [
- "byteorder",
  "crossbeam-utils 0.6.5",
- "parking_lot 0.7.1",
- "rand 0.6.1",
- "scopeguard 0.3.3",
  "serde",
  "serde_json",
- "smallvec",
  "syn 0.15.35",
  "winapi 0.3.6",
 ]

src/tools/rustc-workspace-hack/Cargo.toml

@@ -65,14 +65,8 @@ features = [
 [dependencies]
 curl-sys = { version = "0.4.13", features = ["http2", "libnghttp2-sys"], optional = true }
 crossbeam-utils = { version = "0.6.5", features = ["nightly"] }
-parking_lot = { version = "0.7", features = ['nightly'] }
-rand = { version = "0.6.1", features = ["i128_support"] }
 serde = { version = "1.0.82", features = ['derive'] }
 serde_json = { version = "1.0.31", features = ["raw_value"] }
-smallvec = { version = "0.6", features = ['union', 'may_dangle'] }
-scopeguard = { version = "0.3.3", features = ["use_std", "default"] }
-byteorder = { version = "1.2.7", features = ["i128"] }
-syn = { version = "0.15.35", features = ["extra-traits", "full"] }
 
 
 [target.'cfg(not(windows))'.dependencies]