spamassassin: add upstream fix for perl warning.

srcpkgs/spamassassin/patches/r1791013.patch

@@ -0,0 +1,25 @@
+https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7369
+
+--- lib/Mail/SpamAssassin/PerMsgStatus.pm	2017/04/11 05:54:45	1790926
++++ lib/Mail/SpamAssassin/PerMsgStatus.pm	2017/04/11 18:56:16	1791013
+@@ -916,16 +916,16 @@
+     $str .= shift @{$ary};
+   }
+   undef $ary;
+-  chomp ($str); $str .= " [...]\n";
+ 
+   # in case the last line was huge, trim it back to around 200 chars
+   local $1;
+-  $str =~ s/^(.{,200}).*$/$1/gs;
++  $str =~ s/^(.{200}).+$/$1 [...]/gm;
++  chomp ($str); $str .= "\n";
+ 
+   # now, some tidy-ups that make things look a bit prettier
+-  $str =~ s/-----Original Message-----.*$//gs;
++  $str =~ s/-----Original Message-----.*$//gm;
+   $str =~ s/This is a multi-part message in MIME format\.//gs;
+-  $str =~ s/[-_\*\.]{10,}//gs;
++  $str =~ s/[-_*.]{10,}//gs;
+   $str =~ s/\s+/ /gs;
+ 
+   # add "Content preview:" ourselves, so that the text aligns

srcpkgs/spamassassin/template

@@ -1,7 +1,7 @@
 # Template file for 'spamassassin'
 pkgname=spamassassin
 version=3.4.1
-revision=2
+revision=3
 build_style=perl-module
 # Missing optional dependencies:
 #  Mail::SPF, Geo::IP, Razor2, Encode::Detect, Net::Patricia