fix ci: we need xxhash system lib on macOS

also: we do not need libb2 (directly) any more, this is provided indirectly via python3 now

.github/workflows/ci.yml

@@ -94,9 +94,8 @@ jobs:
       if: ${{ runner.os == 'Linux' }}
       run: |
         sudo apt-get update
-        sudo apt-get install -y libssl-dev libacl1-dev liblz4-dev libzstd-dev pkg-config build-essential
-        sudo apt-get install -y libxxhash-dev || true
-        sudo apt-get install -y libb2-dev || true
+        sudo apt-get install -y pkg-config build-essential
+        sudo apt-get install -y libssl-dev libacl1-dev libxxhash-dev liblz4-dev libzstd-dev
         sudo apt-get install -y libfuse-dev fuse || true  # Required for Python llfuse module
         sudo apt-get install -y libfuse3-dev fuse3 || true  # Required for Python pyfuse3 module
 
@@ -106,6 +105,7 @@ jobs:
         brew install pkg-config || brew upgrade pkg-config
         brew install zstd || brew upgrade zstd
         brew install lz4 || brew upgrade lz4
+        brew install xxhash || brew upgrade xxhash
         brew install openssl@1.1 || brew upgrade openssl@1.1
         brew install --cask macfuse || brew upgrade --cask macfuse  # Required for Python llfuse module