[patch] Benchmarks build issue.

[Don McCoy]

This patch fixes a library path issue with the benchmarks/ directory. 
The came about due to the change in location of the FFTW library files 
(from vendor/fftw/lib to lib/).

I did have one question.  In debugging, I noted that $^ contains only 
the .o files and not the .a files from $(libs).  That is good, because 
it would work correctly otherwise.  But why is this so?  Reading the 
documentation didn't seem to help.

ref: http://www.gnu.org/software/make/manual/make.html#Automatic-Variables

In any case, please let me know if the change is correct.

Thanks,

-- 
Don McCoy
don (at) CodeSourcery
(888) 776-0262 / (650) 331-3385, x712
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