Fix these old spamassassin issues

[wattie]

1. Old patch for SpamAssassin to stop annoying error message which appears on almost every command over the build script.

It is still not mandatory but as Perl 5.30 is coming closer to release, it should be fixed for sure. It's regarding the error message:

Unescaped left brace in regex is deprecated here, passed through in regex; marked by <-- HERE in m/^(.{ <-- HERE ,200}).*$/ at /usr/lib/perl5/site_perl/Mail/SpamAssassin/PerMsgStatus.pm

This error will be fatal in Perl 5.30.

This bug is fixed 15 months ago here: https://svn.apache.org/viewvc?view=revision&revision=1791013


2. Problem with the OS check on FreeBSD which is causing Exim to crash after sa-update.

More information here: http://forum.directadmin.com/showthread.php?t=56583