MFH: r461759

sysutils/bchunk: Update to 1.2.2

Changelog is in:
http://he.fi/bchunk/

freebsd_ports@k-worx.org took maintainership

Additional port changes:

• Changed to DISTVERSION
• Added LICENSE/LICENSE_FILE
• Silenced do-build

PR: 225772
Submitted by: owk <freebsd_ports@k-worx.org>
Approved by: tcberner (mentor, implicit)
Approved by: ports-secteam
Security: CVE-2017-15953, CVE-2017-15954, CVE-2017-15955