fix compiler warnings from version 1.15.1

[svigerske]

Remove unused local variable record_int64.

Fix warning that numSetPackingRows may not be initialized in a symmetry class.

[Opt-Mucca]

Don't see any problems with the the changes! The Julia test fails seem unrelated, and the other two failures seem to be HiPO build related.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.18%. Comparing base (2299abe) to head (bcd7231).
⚠️ Report is 8 commits behind head on latest.

Additional details and impacted files

@@           Coverage Diff           @@
##           latest    #3143   +/-   ##
=======================================
  Coverage   73.18%   73.18%           
=======================================
  Files         430      430           
  Lines      104087   104132   +45     
  Branches    16729    16737    +8     
=======================================
+ Hits        76179    76212   +33     
- Misses      27632    27644   +12     
  Partials      276      276           

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[jajhall]

Thanks. I'm fine with these. If we need an Int64 record in the future, it's soon restored