remove cool.io install

Author: zanejohnson-azure

kubernetes/linux/setup.sh

@@ -80,9 +80,9 @@ echo "$(fluent-bit --version)" >> packages_version.txt
 fluentd_version="1.16.3"
 
 # Pre-install cool.io to avoid ARM64 build issues (segfault during native extension compilation)
-if [ "$ARCH" == "arm64" ]; then
-    gem install cool.io -v "1.9.0" --no-document
-fi
+# if [ "$ARCH" == "arm64" ]; then
+#     gem install cool.io -v "1.9.0" --no-document
+# fi
 
 gem install fluentd -v $fluentd_version --no-document