$NetBSD$

Use standard headers.

--- music.c~	2011-10-03 06:44:38.000000000 +0000
+++ music.c
@@ -5,6 +5,7 @@
  */
 
 #include <string.h>
+#include <stdlib.h>
 #include <ctype.h>
 
 #include "jcabc2ps.h"
