Correctly fetch ppc64el CmdStan

[WardBrian]

Submission Checklist

• Run unit tests
• Declare copyright holder and open-source license: see below

Summary

Resolves #660

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):

Simons Foundation

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)

[codecov-commenter]

Codecov Report

Merging #661 (261493a) into develop (aae75b4) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #661      +/-   ##
===========================================
- Coverage    80.54%   80.51%   -0.03%     
===========================================
  Files           69       69              
  Lines        10641    10641              
===========================================
- Hits          8571     8568       -3     
- Misses        2070     2073       +3     

see 1 file with indirect coverage changes

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