cmake FFTW_HAVE_SPRINT_PLAN examples

ROCm/rocFFT clients/tests/cmake/FindFFTW.cmake :75 

check_symbol_exists( fftwf_sprint_plan "fftw3.h" FFTW_HAVE_SPRINT_PLAN )

ROCm/rocFFT clients/tests/cmake/FindFFTW.cmake :107 

check_symbol_exists( fftw_sprint_plan "fftw3.h" FFTW_HAVE_SPRINT_PLAN )

ROCm/rocFFT clients/tests/cmake/FindFFTW.cmake :111 

target_compile_definitions( rocfft-test PUBLIC FFTW_HAVE_SPRINT_PLAN )