S3 IO library: fix curl timer by calling again if it returns CURLM_CALL_MULTI_PERFORM, in order to make it work with older curl versions. Change curl multi status declaration from int to CURLMcode.
S3 IO library: fix curl timer by calling again if it returns CURLM_CALL_MULTI_PERFORM, in order to make it work with older curl versions. Change curl multi status declaration from int to CURLMcode.

quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs