archivers/py-liblzma: Rename to pylibzma, Modernize

• Rename to match upstream (PyPI) name: pylibzma
• Backport upstream issue/commit to fix build without pkg-config [1][2]
• Remove post-patch: target, no longer necessary
• Remove other setup.py overrides, back to upstream sources
• Add do-test target:
• Add LICENSE_FILE
• Add MOVED entry

While I'm here:

• Update sysutils/bsdploy dependency

[1] https://bugs.launchpad.net/pyliblzma/+bug/613837
[2] https://bazaar.launchpad.net/~proyvind/pyliblzma/trunk/revision/494

Reviewed by: sbz
Approved by: dbn (maintainer timeout, 15 days)
Differential Revision: D4161