[Ur] PATCH: Fix compilation with Clang on OS X

[Austin Seipp]

The attached patch fixes the arguments to the compiler when we're
using clang; -pthread seems to be implicit on OS X, so it bombs out
about unused arguments. The patch basically just un-sets the
pthread-related variables when clang is used. I hope it doesn't break
Linux (haven't had time to test it yet.)

-- 
Regards,
Austin
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