Here we collect arcane knowledge, which may be useful for developers of the module.
third_party/memcached_ibuf.[ch] is the copy of ibuf from the small library
with renaming of the functions. The motivation is to avoid possible name clash
between tarantool's symbols and the module's symbols. See 1 and 2 for
details.
We can remove it, when we'll dedice to drop support of tarantool versions affected by 1 or will find another way to overcome the name clash (see 3).