PPCTASK structure not compatible with OS4 task structure

[DvdBoon]

Some WarpOS programs use variables from the PPCTASK structure, e.g. after a FindTaskPPC(0) it looks at the PPCTASK_MSGPORT and does a WaitPortPPC(). The PPCTASK structure is different from the OS4 task structure and wrong values are being used.

In case of the PPCTASK_MSGPORT: this is now emulated. Unknown at this point is whether other values of the PPCTASK structure are being used by programs.

[DvdBoon]

WarpStat and showtasks look at this structure too. But they first crash by trying to get to the task list using LockTaskList. I guess I have to support that in a way.