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/development/tools/build-managers/wafHook/default.nix

@@ -0,0 +1,9 @@
+{ lib, stdenv, pkgs, makeSetupHook, waf }:
+
+makeSetupHook {
+  substitutions = {
+    inherit waf;
+    crossFlags = lib.optionalString (stdenv.hostPlatform.system != stdenv.targetPlatform.system)
+      ''--cross-compile "--cross-execute=${stdenv.targetPlatform.emulator pkgs}"'';
+  };
+} ./setup-hook.sh

pkgs/development/tools/build-managers/wafHook/setup-hook.sh

@@ -0,0 +1,84 @@
+wafConfigurePhase() {
+    runHook preConfigure
+
+    if ! [ -f "${wafPath:=./waf}" ]; then
+        echo "copying waf to $wafPath..."
+        cp @waf@/bin/waf "$wafPath"
+    fi
+
+    if [ -z "${dontAddPrefix:-}" ] && [ -n "$prefix" ]; then
+        wafConfigureFlags="${prefixKey:---prefix=}$prefix $wafConfigureFlags"
+    fi
+
+    if [ -n "${PKG_CONFIG}" ]; then
+      export PKGCONFIG="${PKG_CONFIG}"
+    fi
+
+    local flagsArray=(
+        "${flagsArray[@]}"
+        $wafConfigureFlags "${wafConfigureFlagsArray[@]}"
+        ${configureTargets:-configure}
+    )
+    if [ -z "${dontAddWafCrossFlags:-}" ]; then
+        flagsArray+=(@crossFlags@)
+    fi
+    echoCmd 'configure flags' "${flagsArray[@]}"
+    python "$wafPath" "${flagsArray[@]}"
+
+    if ! [[ -v enableParallelBuilding ]]; then
+        enableParallelBuilding=1
+        echo "waf: enabled parallel building"
+    fi
+
+    runHook postConfigure
+}
+
+if [ -z "${dontUseWafConfigure-}" -a -z "${configurePhase-}" ]; then
+    configurePhase=wafConfigurePhase
+fi
+
+wafBuildPhase () {
+    runHook preBuild
+
+    # set to empty if unset
+    : ${wafFlags=}
+
+    local flagsArray=(
+      ${enableParallelBuilding:+-j ${NIX_BUILD_CORES}}
+      $wafFlags ${wafFlagsArray[@]}
+      $buildFlags ${buildFlagsArray[@]}
+      ${buildTargets:-build}
+    )
+
+    echoCmd 'build flags' "${flagsArray[@]}"
+    python "$wafPath" "${flagsArray[@]}"
+
+    runHook postBuild
+}
+
+if [ -z "${dontUseWafBuild-}" -a -z "${buildPhase-}" ]; then
+    buildPhase=wafBuildPhase
+fi
+
+wafInstallPhase() {
+    runHook preInstall
+
+    if [ -n "$prefix" ]; then
+        mkdir -p "$prefix"
+    fi
+
+    local flagsArray=(
+        $wafFlags ${wafFlagsArray[@]}
+        $installFlags ${installFlagsArray[@]}
+        ${installTargets:-install}
+    )
+
+    echoCmd 'install flags' "${flagsArray[@]}"
+    python "$wafPath" "${flagsArray[@]}"
+
+    runHook postInstall
+}
+
+if [ -z "${dontUseWafInstall-}" -a -z "${installPhase-}" ]; then
+    installPhase=wafInstallPhase
+fi