Properly implement errno handling for the threaded libc (libc_r)

The powerpc specific code was previously handling system call errors
as if kernel threads existed (currently only userlang threads are modeled).
Thus if multiple threads existed in a process, the process would not
get the correct errno from a system call. This would cause _many_ tests
to fail. Fixing this causes a number of the tests in libc_r/TEST to now work,
that did not before, however a few still fail.

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