Pin libwebsockets to specific commit and not the stable branch
Pin libwebsockets to specific commit and not the stable branch

This branch is for active development, and is seeing API breaking changes

Resolves #211

awslabs/amazon-kinesis-video-streams-webrtc-sdk-c,awslabs/amazon-kinesis-video-streams-webrtc-sdk-c,awslabs/amazon-kinesis-video-streams-webrtc-sdk-c,awslabs/amazon-kinesis-video-streams-webrtc-sdk-c