build!: Remove most unused C code

[codecov[bot]]

Codecov Report

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

Project coverage is 89.07%. Comparing base (e9a0848) to head (c0d6908).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #567 +/- ## ========================================== + Coverage 88.43% 89.07% +0.64% ========================================== Files 58 37 -21 Lines 13537 8084 -5453 ========================================== - Hits 11971 7201 -4770 + Misses 1566 883 -683 ```

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[jserv]

The file scripts/indent.sh seems to be useless during the recent transition to Rust.

[kanru]

The file scripts/indent.sh seems to be useless during the recent transition to Rust.

Thanks, I'm doing more cleaning up. I'll also remove this file.