Create Discord Social SDK Autobuild Package

[bennettgoble]

Description

PR #4457 introduces Discord rich presence support to the Second Life viewer. The SDK that supports this, Discord's Social SDK, is a proprietary library that needs an autobuild package.

Download instructions: https://discord.com/developers/docs/discord-social-sdk/getting-started/using-c++#step-4-download-the-discord-sdk-for-c++

Steps:

• Download social SDK
• Create internal autobuild package
• Add dependency as proprietary lib to viewer
• Update cmake as needed

Notes:

We already have a Discord application set up, please contact @bennettgoble @Geenz or @kylelinden for developer portal access

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