warning in NSObject.m

[Tobias]

hi devels,

i recently noticed a modified line in my -base checkout on my laptop.

NSObject.m emits 2 warnings.
it does so, because we do not cast Protocol (in objc/Protocol) to pcl (in 
NSObject.m.
attached (trivial) patch fixes this warning.

btw: now i noticed, that we do cast Protocol to pcl on some other places as 
well.

~ibotty

NSObject.diff
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