How to reproduce:
1. Open the user's attached project
2. In the "Project" tab, navigate to "Assets/Scripts/ModuleA/NewAssembly" and inspect it in the inspector
3. Notice the errors in "Define Constraints" tab

Expected results: No errors are shown and Assembly Definition Constraints works with global defines
Actual results: "Define constraint is incompatible" error is shown and assembly definition does not work

Reproducible with: 2018.4.15f1, 2019.2.17f1, 2019.3.0f4, 2020.1.0a18
Couldn't test with 2017.4 (it doesn't support assembly definition constraints)

Notes:
1. The global define is detected by scripts, but it doesn't work in assembly definition constrains
2. When using deprecated 3.5 .NET runtime, the global define is not detected in scripts (tested in 2018.4 stream)
3. When the "csc.rsp" file is placed in the same directory as the assembly definition, everything works fine