Add support for nvc++ compiler
- this requires cmake >= 3.20.1 and NVC++ >= 24.1 to work correctly
- To use nvc++ compiler with GROMACS one needs to add these options
-DCMAKE_CXX_COMPILER=<PATH_NVHPC_SDK_COMPILERS_DIR>/bin/nvc++
-DCMAKE_C_COMPILER=<PATH_NVHPC_SDK_COMPILERS_DIR>/bin/nvc
- this is split version of original MR !3733 (closed)
Fixes #4726 (closed)
Edited by Andrey Alekseenko