Steps to reproduce:

1. Open Build Profile window (File > Build Profiles)

2. Create a build profile and add a custom player settings (Press Customize player settings)

3. Change HDR Cubemap Encoding in Other Settings > Rendering

Actual results: 

When changing the HDR Cubemap Encoding for a build profile, it's changing globally (for all profiles and for Project Settings > Player Settings). 

Expected results: 

The HDR Cubemap Encoding should be changed for build profile only