ci: don't do 'brew install pkg-config' anymore

Assume it is installed by default

Author: madebr

.github/workflows/main.yml

@@ -65,8 +65,7 @@ jobs:
       run: |
         brew install \
           autoconf \
-          ninja \
-          pkg-config
+          ninja
 
     - name: Setup Intel oneAPI
       if: matrix.platform.intel