Patch for a bug in NSLocale.m

[Mathias Bauer]

Hi,

I came across a "funny" issue in NSLocale.

Whenever NSLocale reacts on a "defaultsDidChange" notification, it sets 
the _components attributes of the "autoupdatingLocale" instance to nil 
and also sets the currentLocale to nil.

Next time when the currentLocale instance is queried, it is retrieved 
from the "allLocales". The instance returned from there has a 
_components attribute that is nil. This leads to disaster.

_components could be nil just because it always was or because it was 
the "autoupdatingLocale" instance and so it was reset in the 
notification, I didn't dive into that. Instead of that I added the 
attached patch.

Comments welcome.

Regards,
Mathias

NSLocale.diff
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