Bump the requirement to v3.3.0 as available in Ubuntu 16.04 (3.4.10) and
Debian 10 (3.6.7). It was released around 10 years ago and any remotely
supported distribution has newer version.
As result, we can remove hundred+ lines of #ifdef spaghetti code.
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>