/ curl Public
multi: add multi-ignore logic to multi_socket_action #11045
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The multi-ignore logic that was previously applied to curl_multi_perform() (#10750) is here applied to the loop within curl_multi_socket_action() to make it use the same optimization: most handles have the same signal-ignore option state so this drastically reduces the number of ignore/unignore calls per libcurl function invoke.
Follow-up to bc90308