cmake FFTW3f examples

supercollider/supercollider server/scsynth/CMakeLists.txt :11

find_package(FFTW3f 3.3)

asset-group/Sni5Gect-5GNR-sniffing-and-exploitation CMakeLists.txt :174

find_package(FFTW3F REQUIRED)

gnuradio/gnuradio gr-fft/CMakeLists.txt :13

find_package(FFTW3f)