[Bug 227856] print/muttprint: Unbreak with recen

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227856

--- Comment #1 from Romain Tartière <romain at FreeBSD.org> ---
Created attachment 192914
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192914&action=edit
Fix

muttprint will not work with Perl 5.26 and die with the following message:

perl Unescaped left brace in regex is illegal here in regex


According to
https://unix.stackexchange.com/questions/238539/automake-error-unescaped-left-brace-in-regex-is-deprecated#238708
escaping { and } produced a warning with Perl 5.22+ and now fails with Perl
5.26.

The attached patch fix the issue.  A PORTREVISION bump is also included.

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