Request Long internal information from the CURL session

Property definitions

curl $ NativeCurl :: easy_getinfo_long
	# Request Long internal information from the CURL session
	fun easy_getinfo_long(opt: CURLInfoLong): nullable Int
	do
		 var answ = new Ref[Int](0)
		 if not native_getinfo_long(opt, answ).is_ok then return null
		 return answ.item
	end
lib/curl/native_curl.nit:132,2--138,4