Update linux/wsl detection for install arch

[andrjohns]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

The current install process only downloads the correct release tarball for non-x86_64 if the combination is Linux+arm64. This PR updates the detection to correctly handle other architectures on Linux and WSL

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Andrew Johnson

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

Merging #856 (7b18827) into master (17678d5) will decrease coverage by 0.20%.
The diff coverage is 50.00%.

❗ Current head 7b18827 differs from pull request most recent head 17e9ff9. Consider uploading reports for the commit 17e9ff9 to get more accurate results

@@            Coverage Diff             @@
##           master     #856      +/-   ##
==========================================
- Coverage   88.19%   87.99%   -0.20%     
==========================================
  Files          12       12              
  Lines        4218     4233      +15     
==========================================
+ Hits         3720     3725       +5     
- Misses        498      508      +10     

Files Changed	Coverage Δ
R/install.R	63.02% <47.61%> (-1.05%)	⬇️
R/utils.R	72.53% <100.00%> (+0.05%)	⬆️

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