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/compilers/llvm/update.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+set -eu
+
+# Example usage: ./pkgs/development/compilers/llvm/update.sh 12.0.0-rc4
+
+readonly VERSION="$1"
+readonly VERSION_MAJOR="${VERSION%%.*}"
+readonly VERSION_MAIN="${VERSION%%-*}"
+declare VERSION_PATCH="${VERSION/$VERSION_MAIN/}"
+readonly VERSION_PATCH="${VERSION_PATCH/-/}"
+
+readonly DIR="pkgs/development/compilers/llvm/$VERSION_MAJOR"
+readonly FILE="$DIR/default.nix"
+
+sed -Ei \
+  -e "s/release_version = \".+\";/release_version = \"$VERSION_MAIN\";/" \
+  -e "s/candidate = \".*\";/candidate = \"$VERSION_PATCH\";/" \
+  "$FILE"
+
+readonly ATTRSET="llvmPackages_$VERSION_MAJOR"
+
+if [ "$VERSION_MAJOR" -ge "14" ]; then
+  readonly SOURCES=(
+    "llvm.monorepoSrc"
+  )
+elif [ "$VERSION_MAJOR" -eq "13" ]; then
+  readonly SOURCES=(
+    "llvm.src"
+  )
+else
+  readonly SOURCES=(
+    "clang-unwrapped.src"
+    "compiler-rt.src"
+    "clang-unwrapped.clang-tools-extra_src"
+    "libcxx.src"
+    "libcxxabi.src"
+    "libunwind.src"
+    "lld.src"
+    "lldb.src"
+    "llvm.src"
+    "llvm.polly_src"
+    "openmp.src"
+  )
+fi
+
+for SOURCE in "${SOURCES[@]}"; do
+  echo "Updating the hash of $SOURCE:"
+  declare ATTR="$ATTRSET.$SOURCE"
+  declare OLD_HASH="$(nix --extra-experimental-features nix-command eval -f . $ATTR.outputHash)"
+  declare NEW_HASH="\"$(nix-prefetch-url -A $ATTR)\""
+  find "$DIR" -type f -exec sed -i "s/$OLD_HASH/$NEW_HASH/" {} +
+done
+
+echo OK