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>

maintainers/scripts/dep-licenses.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+
+attr=$1
+
+: ${NIXPKGS=/etc/nixos/nixpkgs}
+
+tmp=$(mktemp --tmpdir -d nixpkgs-dep-license.XXXXXX)
+
+exitHandler() {
+    exitCode=$?
+    rm -rf "$tmp"
+    return $exitCode
+}
+
+trap "exitHandler" EXIT
+
+# fetch the trace and the drvPath of the attribute.
+nix-instantiate $NIXPKGS -A $attr --show-trace > "$tmp/drvPath" 2> "$tmp/trace" || {
+  cat 1>&2 - "$tmp/trace" <<EOF
+An error occurred while evaluating $attr.
+EOF
+  exit 1
+}
+
+# generate a sed script based on the trace output.
+sed '
+  \,@:.*:@, {
+    # \1  *.drv file
+    # \2  License terms
+    s,.*@:drv:\(.*\):\(.*\):@.*,s!\1!\1: \2!; t;,
+    s!Str(\\\"\([^,]*\)\\\",\[\])!\1!g
+    b
+  }
+  d
+' "$tmp/trace" > "$tmp/filter.sed"
+
+if test $(wc -l "$tmp/filter.sed" | sed 's/ .*//') == 0; then
+  echo 1>&2 "
+No derivation mentionned in the stack trace.  Either your derivation does
+not use stdenv.mkDerivation or you forgot to use the stdenv adapter named
+traceDrvLicenses.
+
+-  defaultStdenv = allStdenvs.stdenv;
++  defaultStdenv = traceDrvLicenses allStdenvs.stdenv;
+"
+  exit 1
+fi
+
+
+# remove all dependencies which are using stdenv.mkDerivation
+echo '
+d
+' >> "$tmp/filter.sed"
+
+nix-store -q --tree $(cat "$tmp/drvPath") | sed -f "$tmp/filter.sed"
+
+exit 0;