Build cache not invalidated when building targets with different defines

Steps to reproduce:

1. Download unity project "[Internal link]
2. Run CLI build in sequence:

<unity.app> -batchmode -quit -projectPath <path> -executeMethod BuildScript.BuildRetail → OK

<unity.app> -batchmode -quit -projectPath <path> -executeMethod BuildScript.BuildDemo → FAIL

<unity.app> -batchmode -quit -projectPath <path> -executeMethod BuildScript.BuildRetail → FAIL 

Actual results: The second Retail build commands fail.

Expected results: The second Retail build should succeed even after a failing build, as a result of switching defines.

Reproducible with versions: 6000.0.23f1, 6000.3.0a5

Tested on (OS): macOS

Notes:

• The build fails due to an error in code compilation from the previous "BuildDemo" failure.
• Adding BuildOptions.CleanBuildCache to the options does not resolve the issue.
• Using the -rebuildLibrary CLI argument also does not "fix" the third build. To reset the state, the library folder must be manually deleted.

• Deleting Library/EditorUserBuildSettings.asset, fixes the issue.
  (tracks the build configuration for Player or AssetBundles builds.)