Remove a duplicate mysql-test file innodb-index.inc.

mysql-test/suite/innodb/include/innodb-index.inc

---eval create table t1(a int not null, b int, c char(10), d varchar(20), primary key (a)) engine = innodb default charset=$charset
-insert into t1 values (1,1,'ab','ab'),(2,2,'ac','ac'),(3,2,'ad','ad'),(4,4,'afe','afe');
-commit;
---error ER_DUP_ENTRY
-alter table t1 add unique index (b);
-insert into t1 values(8,9,'fff','fff');
-select * from t1;
-show create table t1;
-alter table t1 add index (b);
-insert into t1 values(10,10,'kkk','iii');
-select * from t1;
-select * from t1 force index(b) order by b;
-explain select * from t1 force index(b) order by b;
-show create table t1;
-alter table t1 add unique index (c), add index (d);
-insert into t1 values(11,11,'aaa','mmm');
-select * from t1;
-select * from t1 force index(b) order by b;
-select * from t1 force index(c) order by c;
-select * from t1 force index(d) order by d;
-explain select * from t1 force index(b) order by b;
-explain select * from t1 force index(c) order by c;
-explain select * from t1 force index(d) order by d;
-show create table t1;
-check table t1;
-drop table t1;