Enable previously disabled test cases which were tested against
the embedded build. The test cases are modified so that they require
non-embedded build.


mysql-test/t/disabled.def:
  Re-enabled event_scheduler_basic and event_scheduler_func since
  these tests aren't suppose to work in embedded build anyway.
mysql-test/t/event_scheduler_basic.test:
  Require that this test isn't run on embedded build
mysql-test/t/event_scheduler_func.test:
  Require that this test isn't run on embedded build