compilation with obj-c++, NSPortMessage.h - bug fix for keyword clash.

[John Clayton]

Dear All,

In version 22472 of NSPortMessage.h there is a category added to the  
NSPortMessage called private.

This is bad, because when one compiles using objective-c++ (for  
example, with the latest 4.1.1 GNU C++ compiler) - it breaks, as  
private is of course a reserved keyword.

The fix is trivial:
I changed my NSPortMessage.h category to be private_impl (i.e.  
anything other than 'private') and recompiled - it worked.

Please let me know if you need more information.

John Clayton