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/misc/patchelf/setup-hook.sh

@@ -0,0 +1,22 @@
+# This setup hook calls patchelf to automatically remove unneeded
+# directories from the RPATH of every library or executable in every
+# output.
+
+fixupOutputHooks+=('if [ -z "${dontPatchELF-}" ]; then patchELF "$prefix"; fi')
+
+patchELF() {
+    local dir="$1"
+    [ -e "$dir" ] || return 0
+
+    header "shrinking RPATHs of ELF executables and libraries in $dir"
+
+    local i
+    while IFS= read -r -d $'\0' i; do
+        if [[ "$i" =~ .build-id ]]; then continue; fi
+        if ! isELF "$i"; then continue; fi
+        echo "shrinking $i"
+        patchelf --shrink-rpath "$i" || true
+    done < <(find "$dir" -type f -print0)
+
+    stopNest
+}