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/rust/hooks/cargo-build-hook.sh

@@ -0,0 +1,54 @@
+declare -a cargoBuildFlags
+
+cargoBuildHook() {
+    echo "Executing cargoBuildHook"
+
+    runHook preBuild
+
+    if [ ! -z "${buildAndTestSubdir-}" ]; then
+        # ensure the output doesn't end up in the subdirectory
+        export CARGO_TARGET_DIR="$(pwd)/target"
+
+        pushd "${buildAndTestSubdir}"
+    fi
+
+    if [ "${cargoBuildType}" != "debug" ]; then
+        cargoBuildProfileFlag="--${cargoBuildType}"
+    fi
+
+    if [ -n "${cargoBuildNoDefaultFeatures-}" ]; then
+        cargoBuildNoDefaultFeaturesFlag=--no-default-features
+    fi
+
+    if [ -n "${cargoBuildFeatures-}" ]; then
+        cargoBuildFeaturesFlag="--features=${cargoBuildFeatures// /,}"
+    fi
+
+    (
+    set -x
+    env \
+      "CC_@rustBuildPlatform@=@ccForBuild@" \
+      "CXX_@rustBuildPlatform@=@cxxForBuild@" \
+      "CC_@rustTargetPlatform@=@ccForHost@" \
+      "CXX_@rustTargetPlatform@=@cxxForHost@" \
+      cargo build -j $NIX_BUILD_CORES \
+        --target @rustTargetPlatformSpec@ \
+        --frozen \
+        ${cargoBuildProfileFlag} \
+        ${cargoBuildNoDefaultFeaturesFlag} \
+        ${cargoBuildFeaturesFlag} \
+        ${cargoBuildFlags}
+    )
+
+    if [ ! -z "${buildAndTestSubdir-}" ]; then
+        popd
+    fi
+
+    runHook postBuild
+
+    echo "Finished cargoBuildHook"
+}
+
+if [ -z "${dontCargoBuild-}" ] && [ -z "${buildPhase-}" ]; then
+  buildPhase=cargoBuildHook
+fi