Update Makefile commit to use new Makefile with FFT_INC

[Stephen Biggs-Fox]

With reference to utils issue 1: https://bitbucket.org/gyrokinetics/utils/issues/1/include-fftw3f-instead-of-include-fftw3f

and Makefiles issue 1: https://bitbucket.org/gyrokinetics/makefiles/issues/1

utils/fft_work.fpp has been updated to use include 'fftw3.f' instead of #include 'fftw3.f' as the latter is the FFTW and Fortran recommended methods. However, this requires the directory containing fftw3.f to be included via the -I option when compiling or else the program won't build. Therefore, Makefiles (or environment variables) now need to set FFT_INC = to the correct directory on the target system.

Once the Makefile fixes have been completed (in the Makefiles project), gs2 needs to update which commit of Makefiles it is using so that it gets the new Makefiles.

[Joseph Parker]

@stephen-biggs-fox Is this fixed by Makefiles PR #2?

[David Dickinson]

Closing as no activity and builds appear to work.