buildRustPackage: factor out check phase to cargoCheckHook

API change:

`cargoParallelTestThreads` suggests that this attribute sets the
number of threads used during tests, while it is actually a boolean
option (use 1 thread or NIX_BUILD_CORES threads). In the hook, this
is replaced by a more canonical name `dontUseCargoParallelTests`.

pkgs/build-support/rust/hooks/default.nix

@@ -36,6 +36,15 @@ in {
       };
     } ./cargo-build-hook.sh) {};
 
+  cargoCheckHook = callPackage ({ }:
+    makeSetupHook {
+      name = "cargo-check-hook.sh";
+      deps = [ cargo ];
+      substitutions = {
+        inherit rustTargetPlatformSpec;
+      };
+    } ./cargo-check-hook.sh) {};
+
   cargoInstallHook = callPackage ({ }:
     makeSetupHook {
       name = "cargo-install-hook.sh";