Suppress declared_but_not_referenced warning for NVHPC

  Catch2 suppresses unused variable and equivalent warnings in a couple
  of places, but most importantly, in the declaration of autoRegistrar
  in test registry. This warning gets triggered by NVHPC compiler. The
  current patch adds three macros, namely:

      CATCH_INTERNAL_START_WARNINGS_SUPPRESSION
      CATCH_INTERNAL_SUPPRESS_UNUSED_VARIABLE_WARNINGS
      CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION

  for the NVHPC Compiler which in particular prevents that warning from
  occurring. The compiler is detected completely separately from the
  other compilers in this patch, because from what I found out, NVHPC
  defines __GNUC__ as well for some reason. (I suspect because it
  advertises itself as GNU compatible.)

  We also add a condition to make sure that the `__GNUC__` path is not
  taken by the NVHPC compiler.

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