libregexp: allow up to 128 character classes in one regexp

include/regexp9.h

@@ -61,7 +61,7 @@ struct Reinst{
  */
 struct Reprog{
 	Reinst	*startinst;	/* start pc */
-	Reclass	class[16];	/* .data */
+	Reclass	class[128];	/* .data */
 	Reinst	firstinst[5];	/* .text */
 };