macos: Install lld as a separate "formula" from llvm

Author: MarijnS95

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
     - name: install llvm macos
       if: ${{ matrix.host == 'macos-latest' }}
       run: |
-        brew install llvm
+        brew install llvm lld
         echo "/usr/local/opt/llvm/bin" >> $GITHUB_PATH
 
     - name: install java