Add some missing EXTENSIONS sections to misc tests

Also allow casting CurlMultiHandles

Allow casting CurlHandle to int

(int) $curlHandle will return spl_object_id($curlHandle). This
makes curl handle objects backwards compatible with code using
(int) $curlHandle to obt

Allow casting CurlHandle to int

(int) $curlHandle will return spl_object_id($curlHandle). This
makes curl handle objects backwards compatible with code using
(int) $curlHandle to obtain a resource ID.

Closes GH-5743.

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