build failure on FreeBSD 9.1

[Kazu Yamamoto ( 山本和彦 )]

>> In my case:
>> 
>> 	libffi.so.6 => not found (0)
> 
> Ah, I'm optimistic that
> 
>     commit 51bf3653775ba734f7ca3de99234aba722a0c72c
>     Author: Ian Lynagh <ian at well-typed.com>
>     Date:   Wed Mar 20 19:25:27 2013 +0000
> 
>     Fix build with non-Linux ELF OSes
> 
> will fix this.

This fix does not solve the problem and "validate" still has the same
problem.

Also, it appeared that after building GHC, inplace/lib/bin/ghc-stage2
has the same problem:

	% ldd ghc-stage2 | grep ffi
	libffi.so.6 => not found (0)

--Kazu