Add cmd line option to build pkgs flagged as always update

Make it the default case to not build those packages, helpful
if for example portslist is installed which takes a long time
to build.

autoupdate.pl

@@ -43,6 +43,10 @@ my $show_help = 0;
 # If set to more than one it will try to build ports in parallel
 my $num_jobs = 1;
 
+# If set to 1 update will take those ports into account flagged for always
+# update
+my $always_update = 0;
+
 # If set to 1 the make clean part of the ports build will use sudo
 my $sudo_make_clean = 0;
 my $sudo = $ENV{SUDO};
@@ -349,6 +353,10 @@ sub read_update_package_list {
 			print STDERR 'Ignoring ' . $pkg . "\n";
 			next;
 		}
+		if ($_ =~ m/#\ always-update -> 0,/x && !$always_update) {
+			print STDERR "Ignoring $pkg (always update)\n";
+			next;
+		}
 		push @package_list, ($pkg);
 	}
 	close($in);
@@ -767,6 +775,8 @@ sub usage {
 	    . " -j|--jobs\t\tTry to build packages in parallel\n"
 	    . " \t\t\tIf the filename is '-' the input will be\n"
 	    . " \t\t\tread from stdin\n"
+	    . " -a|--alwaysupdate\tBuild all packages, even those\n"
+	    . "\t\t\tflagged as always update\n"
 	    . " -h|--help\t\tShow this help\n";
 	exit ($show_help ? 0 : 1);
 }
@@ -779,6 +789,7 @@ $SIG{CHLD} = 'DEFAULT';
 my $result = GetOptions("v|verbose=i" => \$verbose,
 			"f|outdated=s" => \$out_of_date,
 			"j|jobs=i" => \$num_jobs,
+			"a|alwaysupdate" => \$always_update,
 			"h|help" => \$show_help);
 
 usage() if ($show_help != 0 || ! $result || $num_jobs < 1);