Amiga-likes: do not call Drivers.GetSystemEvent, FV doesn't really handle it, and causes issues if the system events are swallowed by various components. the IDE has direct system event integration in its main loop.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@29332 3ad0048d-3df7-0310-abae-a5850022a9f2