XtraDB after-merge fixes.

The original XtraDB (and InnoDB plugin) is shipped as a separate source tree which is copied
into the MySQL source, after which a setup.sh script must be run to move things into place.

Now that XtraDB is part of the MariaDB source tree, this commit fixes these things up once
and for all:

 - New innodb build scripts.
 - Test suite fixes (new tests and patches to existing).
 - Remove files no longer needed due to this.

mysql-test/t/innodb_bug40360.test

@@ -0,0 +1,16 @@
+#
+# Make sure http://bugs.mysql.com/40360 remains fixed.
+#
+
+-- source include/not_embedded.inc
+-- source include/have_innodb.inc
+
+SET TX_ISOLATION='READ-COMMITTED';
+
+# This is the default since MySQL 5.1.29 SET BINLOG_FORMAT='STATEMENT';
+
+CREATE TABLE bug40360 (a INT) engine=innodb;
+
+INSERT INTO bug40360 VALUES (1);
+
+DROP TABLE bug40360;