Dust make type doesn't build on Crusher

[bcaddy]

As part of testing the MHD code I've been running all the tests on AMD and NVIDIA. The dust build type won't build at all on AMD systems and throws this error

hipcc -std=c++17 --offload-arch=gfx90a -Wno-unused-result -DCUDA -DMPI_CHOLLA -DBLOCK -DPRECISION=2 -DPPMC -DHLLC -DAVERAGE_SLOW_CELLS -DTEMPERATURE_FLOOR -DVL -DSCALAR -DDUST -DCOOLING_GPU -DSLICES -DPROJECTION -DOUTPUT -DHDF5 -DMPI_GPU -DO_HIP -DGIT_HASH='"01e6cf2630ae9e0951e47c3e6e421a8d7428326b"' -DMACRO_FLAGS='"-DCUDA -DMPI_CHOLLA -DBLOCK -DPRECISION=2 -DPPMC -DHLLC -DAVERAGE_SLOW_CELLS -DTEMPERATURE_FLOOR -DVL -DSCALAR -DDUST -DCOOLING_GPU -DSLICES -DPROJECTION -DOUTPUT -DHDF5 -DMPI_GPU -DO_HIP -DGIT_HASH='"01e6cf2630ae9e0951e47c3e6e421a8d7428326b"'"' -Isrc -I/opt/cray/pe/hdf5/1.12.1.5/crayclang/14.0/include -I/opt/cray/pe/mpich/8.1.17/ofi/crayclang/10.0/include -Wall -ferror-limit=1 -c src/dust/dust_cuda.cu -o src/dust/dust_cuda.o
src/dust/dust_cuda.cu:114:17: error: __device__ function 'calc_tau_sp' cannot overload __host__ __device__ function 'calc_tau_sp'
__device__ Real calc_tau_sp(Real n, Real T) {
                ^
src/dust/dust_cuda.h:15:26: note: previous declaration is here
__device__ __host__ Real calc_tau_sp(Real n, Real T);
                         ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
2 errors generated when compiling for gfx90a.
make: *** [Makefile:189: src/dust/dust_cuda.o] Error 1

[alwinm]

https://github.com/bcaddy/cholla/pull/14

Since I've seen this kind of thing before I made a PR to fix it--just needs to add __host__ consistently

[evaneschneider]

I believe this is fixed in PR #220, but perhaps @bcaddy can confirm and close.

[bcaddy]

It should have been automatically closed by #220 but I must have gotten the syntax wrong