add libtool to macos build tools

Author: harisont

.github/workflows/build-binary-packages.yml

@@ -101,7 +101,8 @@ jobs:
     - name: Install build tools
       run: |
         brew install \
-          automake
+          automake \
+          libtool
         cabal v1-install alex happy
 
     - name: Build package