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/build-support/dotnet/dotnetbuildhelpers/default.nix

@@ -0,0 +1,18 @@
+{ runCommand, mono, pkg-config }:
+  runCommand
+    "dotnetbuildhelpers"
+    { preferLocalBuild = true; }
+    ''
+      target="$out/bin"
+      mkdir -p "$target"
+
+      for script in ${./create-pkg-config-for-dll.sh} ${./patch-fsharp-targets.sh} ${./remove-duplicated-dlls.sh} ${./placate-nuget.sh} ${./placate-paket.sh}
+      do
+        scriptName="$(basename "$script" | cut -f 2- -d -)"
+        cp -v "$script" "$target"/"$scriptName"
+        chmod 755 "$target"/"$scriptName"
+        patchShebangs "$target"/"$scriptName"
+        substituteInPlace "$target"/"$scriptName" --replace pkg-config ${pkg-config}/bin/${pkg-config.targetPrefix}pkg-config
+        substituteInPlace "$target"/"$scriptName" --replace monodis ${mono}/bin/monodis
+      done
+    ''