Support NEC Aurora compiler

[skosukhin]

This updates the CMake scripting to support the NEC SX-Aurora TSUBASA Compiler (a.k.a nfort).

With nfort 5.3.0, all tests pass with -DCMAKE_BUILD_TYPE=Release -DRTE_ENABLE_SP=OFF (i.e. -O3). With -DRTE_ENABLE_SP=ON, all tests pass only with -O1. Any higher optimization level makes check_equivalence_sw_g112 fail with:

   Changing TSI fails
   halving/doubling fails
   Incrementing with 1scl fails
   Incrementing with 2str fails
   Incrementing with nstr fails

[RobertPincus]

@skosukhin You want to merge the PR even under these circumstances?

[skosukhin]

@skosukhin You want to merge the PR even under these circumstances?

Yes, please. To be honest, I still think that there is something strange with the test. I recall problems with it on LUMI with Cray compiler (magically disappeared in #334). If I remember correctly, it's also sensitive to the version of NVHPC in use (I can't find the exact reason for switching to NVHPC 24.9 in Levante CI). The test itself might be fine. Maybe the compilers cannot handle it properly. We will see, I guess.

[RobertPincus]

@skosukhin Sorry this is so awkward but thanks for the support.