Remove useless test innodb.innodb_bug60049

The test innodb.innodb_bug60049 used to check that the record
(ID,NAME)=(12,'SYS_FOREIGN_COLS') is the last record in the
secondary index of the system table SYS_TABLES.
But, ever since commit 23365584
or mysql/mysql-server@082d59670f2616f68af37666fac0f23dbeb43099
that record no longer is the last one in the table!

The more recent test innodb.purge_secondary covers the purge
functionality much better.

mysql-test/suite/innodb/r/innodb_bug60049.result

-CREATE TABLE t(a INT)ENGINE=InnoDB STATS_PERSISTENT=0;
-RENAME TABLE t TO u;
-DROP TABLE u;
-SELECT @@innodb_fast_shutdown;
-@@innodb_fast_shutdown
-0
-Last record of ID_IND root page (9):
-18080000180500c0000000000000000c5359535f464f524549474e5f434f4c53

mysql-test/suite/innodb/t/innodb_bug60049-master.opt

---innodb_fast_shutdown=0

mysql-test/suite/innodb/t/innodb_bug60049.test

-# Bug #60049 Verify that purge leaves no garbage in unique secondary indexes
-# This test requires a fresh server start-up and a slow shutdown.
-# This was a suspected bug (not a bug).
-
--- source include/not_embedded.inc
--- source include/have_innodb.inc
--- source include/have_innodb_16k.inc
-
--- disable_query_log
-call mtr.add_suppression('\\[ERROR\\] InnoDB: Table `mysql`.`innodb_(table|index)_stats` not found');
-call mtr.add_suppression('\\[ERROR\\] InnoDB: Fetch of persistent statistics requested for table `mysql`.`gtid_executed`');
-
-let $create1 = query_get_value(SHOW CREATE TABLE mysql.innodb_table_stats, Create Table, 1);
-let $create2 = query_get_value(SHOW CREATE TABLE mysql.innodb_index_stats, Create Table, 1);
-DROP TABLE mysql.innodb_index_stats;
-DROP TABLE mysql.innodb_table_stats;
--- enable_query_log
-
-CREATE TABLE t(a INT)ENGINE=InnoDB STATS_PERSISTENT=0;
-RENAME TABLE t TO u;
-DROP TABLE u;
-SELECT @@innodb_fast_shutdown;
-let $MYSQLD_DATADIR=`select @@datadir`;
-
---source include/shutdown_mysqld.inc
-
-# Check the tail of ID_IND (SYS_TABLES.ID)
-let IBDATA1=$MYSQLD_DATADIR/ibdata1;
-perl;
-my $file = $ENV{'IBDATA1'};
-open(FILE, "<$file") || die "Unable to open $file";
-# Read DICT_HDR_TABLE_IDS, the root page number of ID_IND (SYS_TABLES.ID).
-seek(FILE, 7*16384+38+36, 0) || die "Unable to seek $file";
-die unless read(FILE, $_, 4) == 4;
-my $sys_tables_id_root = unpack("N", $_);
-print "Last record of ID_IND root page ($sys_tables_id_root):\n";
-# This should be the last record in ID_IND. Dump it in hexadecimal.
-seek(FILE, $sys_tables_id_root*16384 + 152, 0) || die "Unable to seek $file";
-read(FILE, $_, 32) || die "Unable to read $file";
-close(FILE);
-print unpack("H*", $_), "\n";
-EOF
-
---source include/start_mysqld.inc
-
--- disable_query_log
-USE mysql;
-eval $create1;
-eval $create2;