Description:
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As of libcurl 7.10.7 CURLINFO_HTTP_CODE is now known as CURLINFO_RESPONSE_CODE 
this doesn't seem to have been updated in ext/curl the result being a failure if 
CURLINFO_RESPONSE_CODE is used with curl_getinfo

Test script:
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Try to use: curl_getinfo($ch, CURLINFO_RESPONSE_CODE);

Expected result:
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curl_getinfo($ch, CURLINFO_RESPONSE_CODE) should return the same as 
curl_getinfo($ch, CURLINFO_HTTP_CODE) currently does.

Actual result:
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Always fails as CURLINFO_RESPONSE_CODE isn't defined