Fix CMake code.

[1uc]

Includes changes:

• an inconsistency in HIGHFIVE_MAX_ERRORS,
• less deeply nest if-if statements,
• removes debug output.

[codecov[bot]]

Codecov Report

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

Project coverage is 86.81%. Comparing base (5f3ded6) to head (37650df).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1015 +/- ## ======================================= Coverage 86.81% 86.81% ======================================= Files 100 100 Lines 6081 6081 ======================================= Hits 5279 5279 Misses 802 802 ```

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