Set `DEFCUDAVERSION` and `DEFSTDPARCOMPUTECAP` correctly in localrc for NVHPC

[damianam]

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Without these changes those variables are not defined correctly. Example of the resulting difference:

-set DEFCUDAVERSION=12.3;
-set DEFSTDPARCOMPUTECAP=;
+set DEFCUDAVERSION=12;
+set DEFSTDPARCOMPUTECAP=80;