spinor_dilute.cu does not compile for typical staggered MG Nc values

[weinbe2]

Many of the spinor dilution routines do not compile for sufficiently large Nc due to the argument structure being too large, which is reasonable for dilutions including full Nc. There is a workaround going into #1421 which "skips" compiling Nc > 32. This can be addressed in the future as needed.