gitweb: Recognize *-to and Closes/Fixes trailers

Commit trailers like "Thanks-to:", "Fixes:", and "Closes:" are fairly
common, but gitweb didn't highlight them like other trailers.

Signed-off-by: Emma Brooks <me@pluvano.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -4627,7 +4627,7 @@ sub git_print_log {
 	# print log
 	my $skip_blank_line = 0;
 	foreach my $line (@$log) {
-		if ($line =~ m/^\s*([A-Z][-A-Za-z]*-[Bb]y|C[Cc]): /) {
+		if ($line =~ m/^\s*([A-Z][-A-Za-z]*-([Bb]y|[Tt]o)|C[Cc]|(Clos|Fix)es): /) {
 			if (! $opts{'-remove_signoff'}) {
 				print "<span class=\"signoff\">" . esc_html($line) . "</span><br/>\n";
 				$skip_blank_line = 1;