DLL with Define Constraint included in BuildPlayerOptions.extraScriptingDefines is not included in Build

Steps to reproduce:
1. Download and open the user's attached project ("DefineConstraintsIssue-2021.1.zip")
2. In the menu bar click Test > Build

Expected results: build completes successfully
Actual result: build fails with the error "The name 'NLog' does not exist in the current context"

Reproducible with: 2020.3.8f1, 2021.1.7f1, 2021.2.0a16
Could not test: 2019.4, 2018.4 - BuildPlayerOptions.extraScriptingDefines are not introduced in these versions

Notes:

• The issue does not reproduce when building for Windows or MacOS Standalone
• The issue reproduces when building for Android or IOS
• The issue does not reproduce when building through Unity's Build Settings window