Yikes! brew on MacOS is going crazy

The runner has used up 5min of CPU time already and is still going
trying to download and recompile zillions of packages. All I did was:

     brew update
     brew install gawk

Let's try it without the update first.

.github/workflows/mac-make.yaml

@@ -13,7 +13,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Install GNU tar and GNU awk
       run: |
-          brew update
+          type gtar
+          type gawk
           brew install gawk
           brew install gnu-tar
           ls /opt/homebrew/bin