fix: use pkg-config to source liquid-dsp dependency

[EthanJStark]

Hi! Thank you for sharing this project, works great!

I was having an issue since meson.build was looking for Homebrew libraries in specific places (mine are in /usr/local/Cellar/)

This should address that issue.

[windytan]

Thanks for the help! It doesn't seem to work just yet on the CI pipeline; I wonder what the issue is? Here's the snippet from the github runner

Determining dependency 'liquid' with pkg-config executable '/opt/homebrew/bin/pkg-config'
env[PKG_CONFIG_PATH]: 
env[PKG_CONFIG]: /opt/homebrew/bin/pkg-config
-----------
Called: `/opt/homebrew/bin/pkg-config --modversion liquid` -> 1
stderr:
Package liquid was not found in the pkg-config search path.
Perhaps you should add the directory containing `liquid.pc'
to the PKG_CONFIG_PATH environment variable
Package 'liquid' not found

[EthanJStark]

Hi! Thanks for the quick reply.

Just pushed a fix for build.yml d7d8f04

Looks like you need to approve to have the Github workflow rerun

[windytan]

I changed the runner approval setting to the most lenient one now (established users can run).

On my Homebrew macOS I am getting this same error. There doesn't seem to be a liquid.pc file in the system, even though liquid is installed using brew. Seems that liquid doesn't come with one out-of-the-box; I found an open PR about it though.

[windytan]

Ethan, I had the same problem with another project. I've copied my solution here in PR #4 . Can you test that it works for you when you have time.

[windytan]

I believe it can be closed