uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/libraries/elf-header/default.nix

@@ -0,0 +1,44 @@
+{ stdenvNoCC, lib, glibc, musl }:
+
+let
+   libc =
+     if stdenvNoCC.targetPlatform.isMusl
+     then musl
+     else glibc;
+   headerPath =
+     if stdenvNoCC.targetPlatform.isMusl
+     then "musl-${libc.version}/include/elf.h"
+     else "glibc-${libc.version}/elf/elf.h";
+in
+
+stdenvNoCC.mkDerivation {
+  pname = "elf-header";
+  inherit (libc) version;
+
+  src = null;
+
+  dontUnpack = true;
+
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p "$out/include";
+    tar -xf \
+        ${lib.escapeShellArg libc.src} \
+        ${lib.escapeShellArg headerPath} \
+        --to-stdout \
+      | sed -e '/features\.h/d' \
+      > "$out/include/elf.h"
+  '';
+
+  meta = libc.meta // {
+    outputsToInstall = [ "out" ];
+    description = "The datastructures of ELF according to the target platform's libc";
+    longDescription = ''
+      The Executable and Linkable Format (ELF, formerly named Extensible Linking
+      Format), is usually defined in a header like this.
+    '';
+    platforms = lib.platforms.all;
+    maintainers = [ lib.maintainers.ericson2314 ];
+  };
+}