LAMMPSConfig.cmake: fix linking against FFTW3

if(@BUILD_MPI@)

  find_dependency(MPI REQUIRED CXX)

endif()

if(@PKG_KSPACE@ AND @FFT@ STREQUAL "FFTW3")

  if(@FFTW@ STREQUAL "FFTW3" AND NOT TARGET FFTW3::FFTW3)

    add_library(FFTW3::FFTW3 UNKNOWN IMPORTED)

    set_target_properties(FFTW3::FFTW3 PROPERTIES

      IMPORTED_LINK_INTERFACE_LANGUAGES "C"

      IMPORTED_LOCATION "@FFTW3_LIBRARY@"

      INTERFACE_INCLUDE_DIRECTORIES "@FFTW3_INCLUDE_DIRS@")

  endif()

  if(@FFTW@ STREQUAL "FFTW3F" AND NOT TARGET FFTW3F::FFTW3F)

    add_library(FFTW3F::FFTW3F UNKNOWN IMPORTED)

    set_target_properties(FFTW3F::FFTW3F PROPERTIES

      IMPORTED_LINK_INTERFACE_LANGUAGES "C"

      IMPORTED_LOCATION "@FFTW3F_LIBRARY@"

      INTERFACE_INCLUDE_DIRECTORIES "@FFTW3F_INCLUDE_DIRS@")

  endif()

endif()

if(NOT @BUILD_SHARED_LIBS@)

  if(@WITH_JPEG@)

    find_dependency(JPEG REQUIRED)