Fixed GH-15547: curl_multi_wait expects a signed int for timeout.

confusion might come from the previous argument type.
PHP expects ms so we check it fits integer boundaries before the c

Fixed GH-15547: curl_multi_wait expects a signed int for timeout.

confusion might come from the previous argument type.
PHP expects ms so we check it fits integer boundaries before the cast.
raising a warning at least for stable branches.

close GH-15548

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