note the version drop in [MakeMaker]
remove unused lib includes
lower required version of Module::Build

0.3601 is only required for sharedirs; 0.28 is when install_base changed incompatibly.
v5.020

        - the default required version for ExtUtils::MakeMaker in [MakeMaker]
          has been removed
        - load DateTime lazily
        - the default required version for Module::Build in [ModuleBuild] has
          been lowered