[patch] argument processing header dependency

[Don McCoy]

The attached patch checks for the presence of the required header before 
using it in tests/fft_ext/fft_ext.cpp.  If not present, then it defaults 
to accepting a file name only.

This has not yet been tested on a non-gnu system yet.  (I need a bit of 
help getting the build environment set correctly on a Sun machine.)

Regards,

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