sysutils/rsnapshot: unbreak with Perl 5.18

[xmj]

Summary

sysutils/rsnapshot: unbreak with Perl 5.18

• Backport an upstreamed patch which unbreaks rsnapshot with Perl >= 5.18.
• Bump PORTREVISION

PR: 195446
DiffRev: placeholder
Submitted by: David O'Rourke <[e-mail]>
Approved by: swills (mentor)

Test Plan

http://xmj.me/freebsd/buildlogs/rsnapshot-1.3.1_2.log

[koobs]

• Add breadcrumb comment to patch with descr/links to upstream changeset and/or issue ID for our future reference

Otherwise approved.

[xmj]

add breadcrumb

[xmj]

delete duplicate crumb

[koobs]

Approved

[xmj]

Committed revision 374842.