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Kokkos: set cuda's host compiler as petsc's CXX

Junchao Zhang requested to merge jczhang/set-cuda-host-compiler into main

When configuring Kokkos, one can use -DCMAKE_CXX_COMPILER=mpicxx. Kokkos will use mpicxx as the host compiler for nvcc. In other words, we don't need to bother with the nvcc_wrapper thing.

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