darcs patch: Fix freeHaskellFunctionPtr for Darwin/i386

[Aaron Tomb]

This patch fixes the preprocessor directives surrounding the Darwin/ 
i386 portion of freeHaskellFunctionPtr, which had used the wrong  
symbol (x86_HOST_ARCH instead of i386_HOST_ARCH), causing occasional  
FFI problems. This patch is against the 6.8 branch, but will probably  
apply to HEAD, as well.

The problem also exists in 6.6, and I'd be happy to prepare a patch  
against it, too, if there are any plans for another point release.

Aaron

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