Hardening/libcurl

**DON'T MERGE**

Orion uses libcurl to send HTTP requests.
Ok, considering that we are not sure about what it happens :), I'll suggest the following:

* Use the LIBCURL_MEMORY_INITIAL_MEMORY as described above
* Set LIBCURL_MEMORY_INITIAL_MEMORY to 1

In the future, we could change LIBCURL_MEMORY_INITIAL_MEMORY if we want.