CI: use pre-installed cmake

Author: triplef

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Install packages
         run: |
           if [ "$RUNNER_OS" = "macOS" ]; then
-            brew install cmake autoconf automake libtool pkg-config
+            brew install autoconf automake libtool pkg-config
           elif [ "$RUNNER_OS" = "Linux" ]; then
             sudo apt-get install curl cmake make libtool pkg-config texinfo libltdl-dev