remove release-generated files
Port from Build.PL to Makefile.PL

Since Module::Build has issues in cross compiling, move to
ExtUtils::MakeMaker. Together with the move, add appropriate lib checker
based on Config::AutoConf. Update meta-requires appropriately.
Update to ppport.h version 3.24
add some filters to avoid stupid files ...
rm unused Devel::CheckLib bundle, add author tests

t/pod.t is superseeded by xt/pod*.t
ignore Libarchive.bs, too
fix pod-errors
rename Changes file according to common usage
reformat Changes according to CPAN::Changes::Spec