Why oh why is GNUstep's libobjc single threaded on Darwin?

[Wolfgang Lux]

Darwin apparently has Mach threads and also supports Posix threads
(AFAIR right from the start). So why does libobjc's GNUmakefile set
the THREADING variable to single?

I have been using libobjc now for a while with THREADING set to
posix (which is the default model anyway), so I suggest to apply
the patch below.

Wolfgang

libobjc.patch
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