* Handle missing defn of __NR_memfd_create
Generally SYS_foo is defined to __NR_foo (in sys/syscall.h) which is
then defined to a syscall number (in asm/unistd_64.h). Certain CentOS
systems have SYS_memfd_create defined to __NR_memfd_create but are
missing the second definition. This is a belt and suspenders solution
to the problem.
See [this post][syscall] for a nice general description of how these
parts fit together.
[syscall]: https://www.uninformativ.de/blog/postings/2017-02-11/0/POSTING-en.html
* Avoid flake8 warning
* Add package for cctools
Add a package for cctools.
Requires the recently submitted "useshrplib" support in Perl (or some
other mechanism to enable -fPIC for perl).
* Delete extraneous import
* Perl's shared variant changed, adapt...
The name of the variant that perl uses to build a shared lib changed and
it now defaults to True. Use the new name and continue to be insistent
about using the shared variant.
* Flake8 cleanup
