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/compilers/roslyn/create-deps.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p dotnet-sdk_5 -p jq -p xmlstarlet -p curl
+set -euo pipefail
+
+cat << EOL
+{ fetchurl }: [
+EOL
+
+tmpdir="$(mktemp -d -p "$(pwd)")" # must be under source root
+trap 'rm -rf "$tmpdir"' EXIT
+
+HOME="$tmpdir" dotnet msbuild -t:restore -p:Configuration=Release -p:RestorePackagesPath="$tmpdir"/.nuget/packages \
+        -p:RestoreNoCache=true -p:RestoreForce=true \
+        src/NuGet/Microsoft.Net.Compilers.Toolset/Microsoft.Net.Compilers.Toolset.Package.csproj >&2
+
+mapfile -t repos < <(
+    xmlstarlet sel -t -v 'configuration/packageSources/add/@value' -n NuGet.config "$tmpdir"/.nuget/NuGet/NuGet.Config |
+        while IFS= read index
+        do
+            curl --compressed -fsL "$index" | \
+                jq -r '.resources[] | select(."@type" == "PackageBaseAddress/3.0.0")."@id"'
+        done
+)
+
+cd "$tmpdir/.nuget/packages"
+for package in *
+do
+    cd "$package"
+    for version in *
+    do
+        found=false
+        for repo in "${repos[@]}"
+        do
+            url="$repo$package/$version/$package.$version.nupkg"
+            if curl -fsL "$url" -o /dev/null
+            then
+                found=true
+                break
+            fi
+        done
+
+        if ! $found
+        then
+            echo "couldn't find $package $version" >&2
+            exit 1
+        fi
+
+        sha256=$(nix-prefetch-url "$url" 2>/dev/null)
+        cat << EOL
+  {
+    pname = "$package";
+    version = "$version";
+    src = fetchurl {
+      url = "$url";
+      sha256 = "$sha256";
+    };
+  }
+EOL
+    done
+    cd ..
+done
+
+cat << EOL
+]
+EOL