Adjust to SourceType::InTree in several places

These were left over in migrations to subtrees, which should generally be treated
as-if it was local.

Also fixes a warning caused by this change.

Author: Mark-Simulacrum

compiler/rustc_codegen_cranelift/src/bin/cg_clif_build_sysroot.rs

@@ -8,7 +8,6 @@
 
 #![feature(rustc_private)]
 
-extern crate rustc_data_structures;
 extern crate rustc_driver;
 extern crate rustc_interface;
 extern crate rustc_session;

src/bootstrap/check.rs

@@ -262,7 +262,7 @@ impl Step for CodegenBackend {
         let mut cargo = builder.cargo(
             compiler,
             Mode::Codegen,
-            SourceType::Submodule,
+            SourceType::InTree,
             target,
             cargo_subcommand(builder.kind),
         );

src/bootstrap/compile.rs

@@ -817,8 +817,7 @@ impl Step for CodegenBackend {
 
         let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
 
-        let mut cargo =
-            builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
+        let mut cargo = builder.cargo(compiler, Mode::Codegen, SourceType::InTree, target, "build");
         cargo
             .arg("--manifest-path")
             .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));

src/bootstrap/test.rs

@@ -390,7 +390,7 @@ impl Step for Rustfmt {
             host,
             "test",
             "src/tools/rustfmt",
-            SourceType::Submodule,
+            SourceType::InTree,
             &[],
         );