enable features needed by rustfmt to make build system happy and speedup build.
this is what rustc_workspace_hack does in the upstream build.
Gbp-Pq: Name d-0005-clippy-feature-sync.patch
derive-new = "0.5"
regex = "1.4"
quote = "1"
-syn = { version = "1", features = ["full"] }
+syn = { version = "1", features = ["full", "visit"] }
# This is used by the `collect-metadata` alias.
filetime = "0.2"
itertools = "0.8"
toml = "0.5"
serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde_json = { version = "1.0", features = ["unbounded_depth"] }
unicode-segmentation = "1.0.0"
regex = "1.0"
term = "0.6"