linux-packages: init at ${linuxHeaders.version}

This exports the standalone scripts from the Linux tree as usable
package. For example, they are helpful for OS-space developers and
virtualization engineers.

For the beginning, this includes:

`$ extract-vmlinux path/to/bzImage > vmlinux`
`$ extract-ikconfig path/to/bzImage > .config`

pkgs/by-name/li/linux-scripts/package.nix

@@ -0,0 +1,64 @@
+{ lib
+, linuxHeaders # Linux source tree
+, makeWrapper
+, stdenvNoCC
+
+, binutils
+, coreutils
+, gnugrep
+
+  # decompressors for possible kernel image formats
+, bzip2
+, gzip
+, lz4
+, lzop
+, xz
+, zstd
+}:
+
+let
+  commonDeps = [
+    binutils
+    coreutils
+    gnugrep
+    gzip
+    xz
+    bzip2
+    lzop
+    lz4
+    zstd
+  ];
+
+  toWrapScriptLines = scriptName: ''
+    install -Dm 0755 scripts/${scriptName} $out/bin/${scriptName}
+    wrapProgram $out/bin/${scriptName} --prefix PATH : ${lib.makeBinPath commonDeps}
+  '';
+in
+stdenvNoCC.mkDerivation
+{
+  inherit (linuxHeaders) version;
+  pname = "linux-scripts";
+
+  # These scripts will rarely change and are usually not bound to a specific
+  # version of Linux. So it is okay to just use whatever Linux version comes
+  # from `linuxHeaders.
+  src = linuxHeaders.src;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  installPhase = ''
+    ${toWrapScriptLines "extract-ikconfig"}
+    ${toWrapScriptLines "extract-vmlinux"}
+  '';
+
+  meta = with lib; {
+    description = "Standalone scripts from <linux>/scripts";
+    homepage = "https://www.kernel.org/";
+    license = licenses.gpl2Only;
+    maintainers = [ maintainers.phip1611 ];
+    platforms = platforms.all;
+  };
+}