cmake: inject with-pic into Scafacos

                                               --with-internal-fftw

                                               --with-internal-pfft

                                               --with-internal-pnfft

                                               $<$<BOOL:${BUILD_SHARED_LIBS}>:--with-pic>                                               

                                               FC=${CMAKE_MPI_Fortran_COMPILER} 

                                               CXX=${CMAKE_MPI_CXX_COMPILER} 

                                               CC=${CMAKE_MPI_C_COMPILER}