Build with dyanmically loaded libraries

At conda-forge we build with dynamically loaded libraries.

It would be nice to have a switch to enable both.

I had to do a few things:
1. Disable your vendored version of brotli
2. Link to all necessary libraries of brotli using their dyanmic version.

Still a bit of a work in progress, but the patch I had to use can be seen here:
https://github.com/conda-forge/staged-recipes/pull/11913/files