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FindMPI: Deny -fexceptions from NVCC

Axel Huebl requested to merge ax3l/cmake:fix-fexceptionMPInvcc into master

Do not forward -fexceptions (set from MVAPICH2) to NVCC.

Needed for MVAPICH2 with NVCC when using CUDA as first-class CMake language. (Seems to be no problem with legacy FindCUDA.cmake)

Fixes: #18558 (closed)
Backport: release
Topic-rename: FindMPI-nvcc-fexceptions

Edited by Brad King

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