gitweb: pass string after encoding in utf-8 to syntax highlighter

Otherwise the highlight filter would work on a corrupt byte sequence.

Signed-off-by: 张忠山 <zzs213@126.com>
Acked-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -6465,7 +6465,7 @@ sub git_blob {
 			$nr++;
 			$line = untabify($line);
 			printf qq!<div class="pre"><a id="l%i" href="%s#l%i" class="linenr">%4i</a> %s</div>\n!,
-			       $nr, esc_attr(href(-replay => 1)), $nr, $nr, $syntax ? $line : esc_html($line, -nbsp=>1);
+			       $nr, esc_attr(href(-replay => 1)), $nr, $nr, $syntax ? to_utf8($line) : esc_html($line, -nbsp=>1);
 		}
 	}
 	close $fd