Clean up rustc_*/Cargo.toml.

- Sort dependencies and features sections.
- Add `tidy` markers to the sorted sections so they stay sorted.
- Remove empty `[lib`] sections.
- Remove "See more keys..." comments.

Excluded files:
- rustc_codegen_{cranelift,gcc}, because they're external.
- rustc_lexer, because it has external use.
- stable_mir, because it has external use.

compiler/rustc_lint/Cargo.toml

@@ -4,23 +4,25 @@ version = "0.0.0"
 edition = "2021"
 
 [dependencies]
-tracing = "0.1"
-unicode-security = "0.1.0"
-rustc_middle = { path = "../rustc_middle" }
+# tidy-alphabetical-start
+rustc_ast = { path = "../rustc_ast" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_attr = { path = "../rustc_attr" }
-rustc_errors = { path = "../rustc_errors" }
-rustc_hir = { path = "../rustc_hir" }
-rustc_fluent_macro = { path = "../rustc_fluent_macro" }
-rustc_target = { path = "../rustc_target" }
-rustc_ast = { path = "../rustc_ast" }
-rustc_span = { path = "../rustc_span" }
 rustc_data_structures = { path = "../rustc_data_structures" }
+rustc_errors = { path = "../rustc_errors" }
 rustc_feature = { path = "../rustc_feature" }
+rustc_fluent_macro = { path = "../rustc_fluent_macro" }
+rustc_hir = { path = "../rustc_hir" }
 rustc_index = { path = "../rustc_index" }
-rustc_session = { path = "../rustc_session" }
-rustc_trait_selection = { path = "../rustc_trait_selection" }
-rustc_parse_format = { path = "../rustc_parse_format" }
 rustc_infer = { path = "../rustc_infer" }
-rustc_type_ir = { path = "../rustc_type_ir" }
 rustc_macros = { path = "../rustc_macros" }
+rustc_middle = { path = "../rustc_middle" }
+rustc_parse_format = { path = "../rustc_parse_format" }
+rustc_session = { path = "../rustc_session" }
+rustc_span = { path = "../rustc_span" }
+rustc_target = { path = "../rustc_target" }
+rustc_trait_selection = { path = "../rustc_trait_selection" }
+rustc_type_ir = { path = "../rustc_type_ir" }
+tracing = "0.1"
+unicode-security = "0.1.0"
+# tidy-alphabetical-end