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/top-level/nixpkgs-basic-release-checks.nix

@@ -0,0 +1,84 @@
+{ supportedSystems, nixpkgs, pkgs, nix }:
+
+pkgs.runCommand "nixpkgs-release-checks" { src = nixpkgs; buildInputs = [nix]; } ''
+    set -o pipefail
+
+    export NIX_STORE_DIR=$TMPDIR/store
+    export NIX_STATE_DIR=$TMPDIR/state
+    export NIX_PATH=nixpkgs=$TMPDIR/barf.nix
+    opts=(--option build-users-group "")
+    nix-store --init
+
+    echo 'abort "Illegal use of <nixpkgs> in Nixpkgs."' > $TMPDIR/barf.nix
+
+    # Make sure that Nixpkgs does not use <nixpkgs>.
+    badFiles=$(find $src/pkgs -type f -name '*.nix' -print | xargs grep -l '^[^#]*<nixpkgs\/' || true)
+    if [[ -n $badFiles ]]; then
+        echo "Nixpkgs is not allowed to use <nixpkgs> to refer to itself."
+        echo "The offending files: $badFiles"
+        exit 1
+    fi
+
+    src2=$TMPDIR/foo
+    cp -rd $src $src2
+
+    # Check that all-packages.nix evaluates on a number of platforms without any warnings.
+    for platform in ${pkgs.lib.concatStringsSep " " supportedSystems}; do
+        header "checking Nixpkgs on $platform"
+
+        # To get a call trace; see https://nixos.org/manual/nixpkgs/stable/#function-library-lib.trivial.warn
+        # Relies on impure eval
+        export NIX_ABORT_ON_WARN=true
+
+        set +e
+        (
+          set -x
+          nix-env -f $src \
+              --show-trace --argstr system "$platform" \
+              --arg config '{ allowAliases = false; }' \
+              --option experimental-features 'no-url-literals' \
+              -qa --drv-path --system-filter \* --system \
+              "''${opts[@]}" 2> eval-warnings.log > packages1
+        )
+        rc=$?
+        set -e
+        if [ "$rc" != "0" ]; then
+          cat eval-warnings.log
+          exit $rc
+        fi
+
+        s1=$(sha1sum packages1 | cut -c1-40)
+        echo $s1
+
+        nix-env -f $src2 \
+            --show-trace --argstr system "$platform" \
+            --arg config '{ allowAliases = false; }' \
+            --option experimental-features 'no-url-literals' \
+            -qa --drv-path --system-filter \* --system \
+            "''${opts[@]}" > packages2
+
+        s2=$(sha1sum packages2 | cut -c1-40)
+
+        if [[ $s1 != $s2 ]]; then
+            echo "Nixpkgs evaluation depends on Nixpkgs path"
+            diff packages1 packages2
+            exit 1
+        fi
+
+        # Catch any trace calls not caught by NIX_ABORT_ON_WARN (lib.warn)
+        if [ -s eval-warnings.log ]; then
+            echo "Nixpkgs on $platform evaluated with warnings, aborting"
+            exit 1
+        fi
+        rm eval-warnings.log
+
+        nix-env -f $src \
+            --show-trace --argstr system "$platform" \
+            --arg config '{ allowAliases = false; }' \
+            --option experimental-features 'no-url-literals' \
+            -qa --drv-path --system-filter \* --system --meta --xml \
+            "''${opts[@]}" > /dev/null
+    done
+
+    touch $out
+''