libobjc - more header reorganization - patch 4

[Nicola Pero]

Another small incremental change to the libobjc headers.  The most interesting bit is that I added a version number

#define __GNU_LIBOBJC__ 20100911

(it won't need to be updated often as I hope the API will be extremely stable after the revamp).  I took inspiration from __GLIBCXX__.  It did seem strongly missing as  there was no #define to know the version of libobjc that was being used.

objc/objc.h is starting to be in good shape. :-)

Thanks
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