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/os-specific/darwin/apple-source-releases/generate-sdk-packages.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl
+
+# usage:
+#   generate-sdk-packages.sh macos 11.0.1
+
+cd $(dirname "$0")
+
+sdkName="$1-$2"
+outfile="$sdkName.nix"
+
+>$outfile echo "# Generated using:  ./$(basename "$0") $1 $2
+
+{ applePackage' }:
+
+{"
+
+parse_line() {
+    readarray -t -d$'\t' package <<<$2
+    local pname=${package[0]} version=${package[1]}
+
+    if [ -d $pname ]; then
+        sha256=$(nix-prefetch-url "https://opensource.apple.com/tarballs/$pname/$pname-$version.tar.gz")
+        >>$outfile echo "$pname = applePackage' \"$pname\" \"$version\" \"$sdkName\" \"$sha256\" {};"
+    fi
+}
+readarray -s1 -c1 -C parse_line < <(curl -sS "https://opensource.apple.com/text/${sdkName//./}.txt")
+
+>>$outfile echo '}'