Update BuildProcessor to support Android x86_64

[Babilinski]

Updated the Build Processor script to prevent logging a warning when building for Android x86_64 architecture since it is now supported.

[unity-cla-assistant]

All committers have signed the CLA.

[karasusan]

Thank you for the contribution!
It looks no problem. I'm only curious about contents of the log when the Android architecture is not supported.

Debug.LogWarning(
                    $"WebRTC apps require a target architecture to be set {RequiredAndroidArchitectures}. " +
                    $"Currently set to {PlayerSettings.Android.targetArchitectures}");

[Babilinski]

Ahh I see, the warning would log the following message:

"WebRTC apps require a target architecture to be set ARM64, X86_64. Currently set to X86_64"

How do you feel about updating the wording to log this message instead?

"WebRTC apps are only supported on the following CPU architectures: ARM64, X86_64. Current target architecture set to: X86_64"

By changing the code to :

Debug.LogWarning(
            $"WebRTC apps are only supported on the following CPU architectures: {RequiredAndroidArchitectures}. " +
            $"Current target architecture set to: {PlayerSettings.Android.targetArchitectures}");