[libobjc, committed] Wrap CLASS_TABLE_HASH in do {} while (0)

[Tom de Vries]

Hi,

this patch wraps CLASS_TABLE_HASH in "do {} while (0)". This allows the 
macro to be used in if-then-elses without curly braces.

Build libobcj for x86_64.

Committed as obvious.

Thanks,
- Tom
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