Revert "move lipo wrapper"

This reverts commit 56dbd91c96.

ios/scripts/lipo

@@ -0,0 +1,15 @@
+#!/bin/sh
+# Workaround for NixOS/nixpkgs#405066: frameworks copied from the Nix store
+# stay read-only, so lipo can't write its temporary output file when Flutter
+# thins them during the build. Make the framework writable before delegating
+# to the real lipo.
+for arg in "$@"; do
+  case "$arg" in
+    */*.framework/*)
+      fw_dir="${arg%.framework/*}.framework"
+      chmod -R +w "$fw_dir" 2>/dev/null
+      ;;
+  esac
+done
+
+exec /usr/bin/lipo "$@"