COMP: fix detection of curl multi

CMake/TestCurlMulti.cxx

@@ -5,6 +5,7 @@ int main(int argc,char * argv[])
 {
   CURLM *             multiHandle;
   multiHandle = curl_multi_init();
+  curl_multi_setopt(multiHandle, CURLMOPT_MAXCONNECTS, 10);
   curl_multi_cleanup(multiHandle);
 
   return 0;