Cuesheet patch from Earl Chew.

When reading the INDEX from the cue sheet, the format MM:SS:FF format
is disallowed if the sample frequency is not a multiple of 75 because
the index would only be approximate. However, 00:00:00 is _exact_
because it denotes the start of the track, so allow it as a special
case.

src/share/grabbag/cuesheet.c

@@ -369,7 +369,8 @@ static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message,
 						}
 					}
 				}
-				else if(sample_rate % 75) {
+				else if(sample_rate % 75 && xx) {
+                                        /* only sample zero is exact */
 					*error_message = "illegal INDEX offset (MM:SS:FF form not allowed if sample rate is not a multiple of 75)";
 					return false;
 				}