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/interpreters/lua-5/hooks/default.nix

@@ -0,0 +1,27 @@
+# Hooks for building lua packages.
+{ lua
+, lib
+, makeSetupHook
+, findutils
+, runCommand
+}:
+
+let
+  callPackage = lua.pkgs.callPackage;
+  luaInterpreter = lua.interpreter;
+in {
+
+  lua-setup-hook = LuaPathSearchPaths: LuaCPathSearchPaths:
+    let
+      hook = ./setup-hook.sh;
+    in runCommand "lua-setup-hook.sh" {
+      # hum doesn't seem to like caps !! BUG ?
+      luapathsearchpaths=lib.escapeShellArgs LuaPathSearchPaths;
+      luacpathsearchpaths=lib.escapeShellArgs LuaCPathSearchPaths;
+    } ''
+      cp ${hook} hook.sh
+      substituteAllInPlace hook.sh
+      mv hook.sh $out
+    '';
+
+}

pkgs/development/interpreters/lua-5/hooks/setup-hook.sh

@@ -0,0 +1,47 @@
+# set -e
+
+nix_print() {
+  if [ ${NIX_DEBUG:-0} -ge $1 ]; then
+    echo "$2"
+  fi
+}
+
+nix_debug() {
+  nix_print 3 "$1"
+}
+
+addToLuaSearchPathWithCustomDelimiter() {
+  local varName="$1"
+  local absPattern="$2"
+  # delete longest match starting from the lua placeholder '?'
+  local topDir="${absPattern%%\?*}"
+
+  # export only if the folder exists else LUA_PATH/LUA_CPATH grow too large
+  if [[ ! -d "$topDir" ]]; then return; fi
+
+  # export only if we haven't already got this dir in the search path
+  if [[ ${!varName-} == *"$absPattern"* ]]; then return; fi
+
+  export "${varName}=${!varName:+${!varName};}${absPattern}"
+}
+
+addToLuaPath() {
+  local dir="$1"
+
+  if [[ ! -d "$dir" ]]; then
+    nix_debug "$dir not a directory abort"
+    return 0
+  fi
+  cd "$dir"
+  for pattern in @luapathsearchpaths@; do
+    addToLuaSearchPathWithCustomDelimiter LUA_PATH "$PWD/$pattern"
+  done
+
+  # LUA_CPATH
+  for pattern in @luacpathsearchpaths@; do
+    addToLuaSearchPathWithCustomDelimiter LUA_CPATH "$PWD/$pattern"
+  done
+  cd - >/dev/null
+}
+
+addEnvHooks "$hostOffset" addToLuaPath