Build with CMake, using the following options:

```
cmake -B build-x86 -DCMAKE_LIBRARY_PATH=/usr/local/lib -DCMAKE_OSX_ARCHITECTURES="x86_64" \
    -DCMAKE_OSX_DEPLOYMENT_TARGET="10.13" -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_SHARED_LIBS=ON
cmake -B build-arm -DCMAKE_OSX_ARCHITECTURES="arm64" -DCMAKE_OSX_DEPLOYMENT_TARGET="11.0" \
    -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_SHARED_LIBS=ON
```

For the debug overlay, BUILD_TYPE was replaced with `Debug`.

And some minor tweaks with `install_name_tool -change` to fix up the
resulting libFLAC.14.dylib so that it imports libogg.0.dylib using an
@rpath path instead of an absolute path to Homebrew's install.

Version 1.5.0 was used from the official source code download:

https://downloads.xiph.org/releases/flac/flac-1.5.0.tar.xz

x86_64 and arm64 were built separately, to allow for intrinsic functions
to be used for x86_64.