Improve cuda gencode flags

[agirault]

Context

• The current cuda SASS/PTX list is hardcoded manually based on a versioning heuristic that is error-prone. Case in point:
  • blackwell sm 10.1 is missing
  • blackwell sm 10.0 is supported after 12.8, not 12.6.

    make[1]: Entering directory '***/gdrcopy/tests'
    /usr/local/cuda/bin/nvcc -o pplat.o -c pplat.cu -lcuda -lpthread -ldl -lgdrapi -I /usr/local/cuda/include -I ../include -I ../src -I /usr/local/cuda/include  -gencode arch=compute_60,code=compute_60 -gencode arch=compute_61,code=compute_61 -gencode arch=compute_62,code=compute_62 -gencode arch=compute_70,code=compute_70 -gencode arch=compute_72,code=compute_72 -gencode arch=compute_75,code=compute_75 -gencode arch=compute_80,code=compute_80 -gencode arch=compute_86,code=compute_86 -gencode arch=compute_87,code=compute_87 -gencode arch=compute_90,code=compute_90 -gencode arch=compute_100,code=compute_100 -gencode arch=compute_60,code=sm_60 -gencode arch=compute_61,code=sm_61 -gencode arch=compute_62,code=sm_62 -gencode arch=compute_70,code=sm_70 -gencode arch=compute_72,code=sm_72 -gencode arch=compute_75,code=sm_75 -gencode arch=compute_80,code=sm_80 -gencode arch=compute_86,code=sm_86 -gencode arch=compute_87,code=sm_87 -gencode arch=compute_90,code=sm_90 -gencode arch=compute_100,code=sm_100
    nvcc fatal   : Unsupported gpu architecture 'compute_100'
    make[1]: *** [Makefile:54: pplat.o] Error 1
    

• full arch list are used for code (SASS) and compute (PTX). For PTX, only latest is needed.

Changes

• Use sm list from nvcc --list-gpu-code directly when available
• Fix blackwell sm list and version compatibility
• Consolidate compute & sm list in a single variable
• Only build PTX for last supported arch

[pakmarkthub]

@agirault The fix has been merged to R2.5 branch (https://github.com/NVIDIA/gdrcopy/tree/R2.5)