1918 Allow alternate cmake generator for gitlab CI

[nlslatt]

One of our Gitlab CI pipelines fails due to something that is Ninja-related, so stop hard-coding Ninja use.

Closes #1918.

[github-actions]

Pipelines results

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PR tests (clang-10, ubuntu, mpich)

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[codecov]

Codecov Report

Merging #1919 (356b1fa) into develop (1dbfb5e) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1919   +/-   ##
========================================
  Coverage    84.45%   84.45%           
========================================
  Files          761      761           
  Lines        26866    26866           
========================================
+ Hits         22689    22691    +2     
+ Misses        4177     4175    -2     

Impacted Files	Coverage Δ
src/vt/phase/phase_manager.cc	92.56% <0.00%> (+1.35%)	⬆️