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/dotnet/build-dotnet-module/hooks/dotnet-build-hook.sh

@@ -0,0 +1,42 @@
+# inherit arguments from derivation
+dotnetBuildFlags=( ${dotnetBuildFlags[@]-} )
+
+dotnetBuildHook() {
+    echo "Executing dotnetBuildHook"
+
+    runHook preBuild
+
+    if [ "${enableParallelBuilding-}" ]; then
+        maxCpuFlag="$NIX_BUILD_CORES"
+        parallelBuildFlag="true"
+    else
+        maxCpuFlag="1"
+        parallelBuildFlag="false"
+    fi
+
+    if [ "${version-}" ]; then
+        versionFlag="-p:Version=${version-}"
+    fi
+
+    for project in ${projectFile[@]} ${testProjectFile[@]}; do
+        env \
+            dotnet build "$project" \
+                -maxcpucount:$maxCpuFlag \
+                -p:BuildInParallel=$parallelBuildFlag \
+                -p:ContinuousIntegrationBuild=true \
+                -p:Deterministic=true \
+                --configuration "@buildType@" \
+                --no-restore \
+                ${versionFlag-} \
+                ${dotnetBuildFlags[@]}  \
+                ${dotnetFlags[@]}
+    done
+
+    runHook postBuild
+
+    echo "Finished dotnetBuildHook"
+}
+
+if [[ -z "${dontDotnetBuild-}" && -z "${buildPhase-}" ]]; then
+    buildPhase=dotnetBuildHook
+fi