built-in FFTW3 integration

[Jules Bergmann]

Nathan,

Refresh my memory, why do we need to regenerate configure for FFTW3? 
Fixing up the loose ends in your patch, it works fine with the upstream 
FFTW3 configure.  I tested locally (i686) and on Setha (x86-64).  I had 
to disable the use of SIMD on sethra do to the following errors when 
compiling FFTW3:

gcc -DHAVE_CONFIG_H -I. -I../../fftw-3.0.1/simd -I.. 
-I../../fftw-3.0.1/kernel -O3 -fomit-frame-pointer -fno-schedule-insns 
-fstrict-aliasing -mpreferred-stack-boundary=4 -msse -MT sse.lo -MD -MP 
-MF .deps/sse.Tpo -c ../../fftw-3.0.1/simd/sse.c -o sse.o
/tmp/cckBDFeA.s: Assembler messages:
/tmp/cckBDFeA.s:83: Error: suffix or operands invalid for `push'
/tmp/cckBDFeA.s:85: Error: suffix or operands invalid for `pop'

I see the same errors when configuring/compiling FFTW3 outside of 
VSIPL++.  Once we figure out how to fix these, we can re-enable SIMD for 
x86-64.

Below are the changes relative to the patch you posted.  I did not apply 
the results of re-running FFTW3's bootstrap.

Patch applied.

				-- Jules


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