Use get_nvidia_cc to get Nvidia gpu architecture

[ggorman]

Use get_nvidia_cc to get Nvidia gpu architecture rather than using '-arch=native'.

This fixes compilation errors on the Nvidia Jetson.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 86.66%. Comparing base (39ea32a) to head (6e64c16).

Files	Patch %	Lines
devito/arch/compiler.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2343      +/-   ##
==========================================
- Coverage   86.67%   86.66%   -0.01%     
==========================================
  Files         232      232              
  Lines       43442    43445       +3     
  Branches     8062     8063       +1     
==========================================
  Hits        37653    37653              
- Misses       5084     5087       +3     
  Partials      705      705              

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[mloubout]

Commit name doesn't follow guidelines, should be

arch: Use get_nvidia_cc to get Nvidia gpu architecture ....