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wav: see if there is an id3v2 tag at the end

Audacity appends id3v2 tag at the end if Unicode tags were used.
Makes sense to try parsing it as well.

binary files a/input/noise.wav b/input/noise.wav differ

--- a/wav.c

+++ b/wav.c

@@ -86,5 +86,9 @@

 			return -1;

 	}

+	/* some software may append an id3v2 tag */

+	if(i > 0 && ctx->read(ctx, d, 8) == 8 && memcmp(d, "id3 ", 4) == 0)

+		tagid3v2(ctx);

+

 	return i > 0 ? 0 : -1;

 }