You can build the project for unsupported Color Space for Windows MR

To reproduce:
1. Create a new project for Windows MR
2. Check that Project Settings/Player/Other Settings/Color Space is set to Gamma (the default)
3. Build the project

Expected result: You get a warning or an error telling you that this is not supported
Actual result: The project builds sometimes, sometimes fails with errors. The built behavior is unclear

Note: This is not consistent with how other platforms verify supported stats, as some of our platforms give warnings/errors in such cases (iOS, for example)