This reverts commit 0c2a885c66.
Reverting for now due to reproducibility issues:
```
error: /Users/vagrant/Downloads/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate: can't open file: /tmp/electrum_compare_dmg/signed_app/Electrum.app/Contents/MacOS/libffi.8.dylib (No such file or directory)
```
`Electrum.app/Contents/MacOS/libffi.8.dylib` is included when building on one machine, but missing on the other...
Will have to investigate later.
related https://github.com/spesmilo/electrum/pull/7918