clozure-cl: deprecate on macOS

Author: cho-m

Formula/c/clozure-cl.rb

@@ -21,6 +21,14 @@ class ClozureCl < Formula
   # https://github.com/Clozure/ccl/issues/11
   depends_on arch: :x86_64
 
+  on_macos do
+    # Can be undeprecated if upstream decides to support arm64 macOS
+    # https://docs.brew.sh/Support-Tiers#future-macos-support
+    # TODO: Make linux-only when removing macOS support
+    deprecate! date: "2025-09-25", because: :unsupported
+    disable! date: "2026-09-25", because: :unsupported
+  end
+
   on_linux do
     depends_on "m4"
   end