Use a DrylandEcology fork of pcg

[dschlaep]

• branch "feature_sw2" of the DrylandEcology fork of pcg contains a commit that "Fix[es] function declaration without a prototype"

• close clang strict-prototypes warnings #353 "clang strict-prototypes warnings"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.80%. Comparing base (055bb84) to head (5094acc).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/devel_v8.0.0     #394   +/-   ##
=====================================================
  Coverage                 72.80%   72.80%           
=====================================================
  Files                        20       20           
  Lines                      5640     5640           
=====================================================
  Hits                       4106     4106           
  Misses                     1534     1534           

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