Author: Ankit Agarwal
MDL-55777 installation: Check libcurl version on install
http://git.moodle.org/gw?p=moodle.git;a=commit;h=26f355492285d0a57da529263e662b7c2d8761f8
http://github.com/moodle/moodle/commit/26f355492285d0a57da529263e662b7c2d8761f8
+ 3.1 en [libcurlwarning,core_admin]