change fftw to use 64-bit interface
change fftw to use 64-bit interface

sidward/bart,sidward/bart,sidward/bart,mrirecon/bart,sdimoudi/bart,mrirecon/bart,sdimoudi/bart,mrirecon/bart,Takishima/bart,sdimoudi/bart,Takishima/bart,sdimoudi/bart,sidward/bart,Takishima/bart,sdimoudi/bart,Takishima/bart,mrirecon/bart,mrirecon/bart,Takishima/bart,sidward/bart