Resolves build issues with the extension example (#419)

* resolved extension build issues and added test to ci

* missing gguflib

* rebased

* force mlx install from fix branch

* linux build issue

* point to git install and comment out ci tests

.circleci/config.yml

@@ -38,6 +38,11 @@ jobs:
           name: Run the python tests
           command: |
             python3 -m unittest discover python/tests
+      # TODO: Reenable when extension api becomes stable
+      # - run:
+      #     name: Build example extension
+      #     command: |
+      #       cd examples/extensions && python3 -m pip install . 
       - run:
           name: Build CPP only
           command: |
@@ -78,6 +83,13 @@ jobs:
             conda activate runner-env
             DEVICE=cpu python -m xmlrunner discover -v python/tests -o test-results/cpu
             DEVICE=gpu python -m xmlrunner discover -v python/tests -o test-results/gpu
+      # TODO: Reenable when extension api becomes stable
+      # - run:
+      #     name: Build example extension
+      #     command: |
+      #       eval "$(conda shell.bash hook)"
+      #       conda activate runner-env
+      #       cd examples/extensions && python -m pip install . 
       - store_test_results:
           path: test-results
       - run: