cargo-kcov: ensure kcov is in PATH

The tool is non-functional without this.

pkgs/tools/package-management/cargo-kcov/default.nix

@@ -1,6 +1,8 @@
 { lib
 , rustPlatform
 , fetchFromGitHub
+, makeWrapper
+, kcov
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -17,6 +19,13 @@ rustPlatform.buildRustPackage rec {
   cargoSha256 = "0m5gfyjzzwd8wkbb388vmd785dy334x0migq3ssi7dlah9zx62bj";
   doCheck = false;
 
+  nativeBuildInputs = [ makeWrapper ];
+
+  postInstall = ''
+    wrapProgram $out/bin/cargo-kcov \
+        --prefix PATH : ${lib.makeBinPath [ kcov ]}
+  '';
+
   meta = with lib; {
     description = "Cargo subcommand to run kcov to get coverage report on Linux";
     homepage = "https://github.com/kennytm/cargo-kcov";