make NVHPC a full toolchain with nvidia-compilers, NVHPCX and NVBLAS #4927
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Fixes #4853
Enhance NVHPC to be a full toolchain:
nvidia-compilerssubtoolchainnvidia-compilerswill have their own easyconfigsNVHPCXsubtoolchainNVHPCXis bundled in NVHPC so it will not exist with their own easyconfigsNVBLASsubtoolchainNVBLASis bundled in NVHPC so it will not exist with their own easyconfigsI also added two extra features to NVHPC:
cuda_compute_capabilitiescan be defined from environment variable$EBNVHPCCUDACC: this environment variable can be set bynvidia-compilersorNVHPCif they are installed with a givencuda_compute_capabilities, avoiding the need to manually setcuda_compute_capabilitiesfor every installation in that toolchain.%(cudaver)s) will be defined from environment variable$EBNVHPCCUDAVER: this environment variable will be set bynvidia-compilersorNVHPC, allowing to use those templates in all easyconfigs in the toolchain without having to depend on CUDA.