Silence CMake FFTW3_MPI warning
Silence the following warning that appeared with CMake 3.17:
CMake Warning (dev) at /opt/local/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:272 (message):
The package name passed to `find_package_handle_standard_args` (FFTW3_MPI)
does not match the name of the calling package (FFTW3). This can lead to
problems in calling code that expects `find_package` result variables
(e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
cmake/FindFFTW3.cmake:15 (find_package_handle_standard_args)
CMakeLists.txt:963 (find_package)
This warning is for project developers. Use -Wno-dev to suppress it.