branches/5.1: fix bug#49396: main.innodb test fails in embedded mode

Change replace_result by using $MYSQLD_DATADIR. Tested in both embedded
mode and normal server mode.

mysql-test/innodb.test

@@ -15,6 +15,8 @@
 
 -- source include/have_innodb.inc
 
+let $MYSQLD_DATADIR= `select @@datadir`;
+
 # Save the original values of some variables in order to be able to
 # estimate how much they have changed during the tests. Previously this
 # test assumed that e.g. rows_deleted is 0 here and after deleting 23
@@ -1697,7 +1699,7 @@ set foreign_key_checks=0;
 create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=latin1;
 create table t3(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=utf8;
 # Embedded server doesn't chdir to data directory
---replace_result $MYSQLTEST_VARDIR . master-data/ ''
+--replace_result $MYSQLD_DATADIR ./ master-data/ ''
 -- error 1025
 rename table t3 to t1;
 set foreign_key_checks=1;
@@ -2337,7 +2339,7 @@ ALTER TABLE t2 ADD FOREIGN KEY (a) REFERENCES t1 (a) ON DELETE SET NULL;
 # mysqltest first does replace_regex, then replace_result
 --replace_regex /'[^']*test\/#sql-[0-9a-f_]*'/'#sql-temporary'/
 # Embedded server doesn't chdir to data directory
---replace_result $MYSQLTEST_VARDIR . master-data/ ''
+--replace_result $MYSQLD_DATADIR ./ master-data/ ''
 --error 1025
 ALTER TABLE t2 MODIFY a INT NOT NULL;
 DELETE FROM t1;