Remove PPC_FMT_FLAGS setting from libenvpp.cmake

[aobolensk]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.89%. Comparing base (d6e198c) to head (e104976).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #569   +/-   ##
=======================================
  Coverage   94.89%   94.89%           
=======================================
  Files          11       11           
  Lines         372      372           
  Branches      124      124           
=======================================
  Hits          353      353           
  Misses          5        5           
  Partials       14       14           

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