Feature compile lib

[dschlaep]

• test compilation of SOILWAT2 as library for STEPWAT2 and rSOILWAT2

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.72%. Comparing base (36cb14e) to head (c5f29c2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/devel_v8.0.0 #402 +/- ## ===================================================== Coverage 72.72% 72.72% ===================================================== Files 20 20 Lines 5650 5650 ===================================================== Hits 4109 4109 Misses 1541 1541 ```

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