How to reproduce:
1. Create a new project
2. In the Project Settings, set the Scripting Backend to "IL2CPP" (Edit->Project Settings->Player->Other Settings->Configuration)
3. In Build Settings, check the "Create Xcode Project" option
4. Make a build
5. Open the created Xcode project
6. In the Xcode IDE, make a build (Product->Archive)
7. Go to the Xcode build's directory (/Users/<user>/Library/Developer/Xcode/DerivedData/<project name>-<id>/Build/Intermediates.noindex/<project name>.build/Debug/GameAssembly.build)
8. Open the .sh script
9. Inspect the "MONO" variable

Expected result: MONO variable's path has quotes
Actual result: MONO variable's path doesn't have quotes

Reproducible with: 2019.4.10f1, 2020.1.5f1, 2020.2.0b2
Couldn't test with: 2018.4.27f1 (There's no option to "Create Xcode Project" in build settings)