Bug#19728: Test mysqldump failure

regex is fixed for windows.

mysql-test/t/mysqldump.test

@@ -1186,7 +1186,7 @@ select * from words2;
 
 # Drop table "words" and run with threads, should fail
 drop table words;
---replace_regex /.*mysqlimport/mysql-import/
+--replace_regex /.*mysqlimport(\.exe)*/mysql-import/
 --error 1
 --exec $MYSQL_IMPORT --silent --use-threads=2 test $MYSQLTEST_VARDIR/tmp/t1.txt $MYSQLTEST_VARDIR/tmp/t2.txt $MYSQLTEST_VARDIR/std_data_ln/words.dat $MYSQLTEST_VARDIR/std_data_ln/words2.dat 2>&1