Build problems with websocketpp

[mgeier]

zaphoyd/websocketpp#1157
zaphoyd/websocketpp#1169

unmerged PR with fix: zaphoyd/websocketpp#1164

In our CI, I have already switched to manually building the PR in #417.

Homebrew has deprecated the websocketpp package: Homebrew/homebrew-core#219326

I don't know how to handle this in our own brew package: https://github.com/SoundScapeRenderer/homebrew-ssr/blob/main/Formula/ssr.rb

Maybe we'll have to create an inofficial websocketpp package, like we did for https://github.com/SoundScapeRenderer/homebrew-ssr/blob/main/Formula/libmysofa.rb?

Any other ideas?