[BUG][FIX] Linux 2GB problem in FFI

[Bert Freudenberg]

This bug is similar to the image segment loading problem when the 
object memory spans the 2GB boundary. Ned has fixed that, but FFI uses 
the #isInMemory: method which was not fixed.

The attached changeset makes #startOfMemory return an unsigned value 
(just like endOfMemory, which Ned fixed), and casts the parameter of 
#isInMemory: to unsigned.

- Bert -
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