C API: Some boolean options do not use unsigned char

I am developing Kotlin/Native bindings for RocksDB using the C API. I have found that some functions relating to boolean configuration properties in `c.h` do not match the documentation

### Expected behavior

I expect that functions that set/get boolean properties use the `unsigned char` to represent boolean

> Bools have the type unsigned char (0 == false; rest == true)

https://github.com/facebook/rocksdb/blob/0a2d3b663a962cf86af5ad82c80baf1cd71f7766/include/rocksdb/c.h#L40

### Actual behavior

I observe that the set/get types of some properties do not match.

For example, `disable_auto_compactions`

https://github.com/facebook/rocksdb/blob/0a2d3b663a962cf86af5ad82c80baf1cd71f7766/include/rocksdb/c.h#L1487-L1490

The name indicates that this should be a boolean property.

* The getter returns `unsigned char` (as expected)
* The setter expects an `int` (which I do not expect)

### Steps to reproduce the behavior

These are the options that I think have mismatched functions

* `report_bg_io_stats`
https://github.com/facebook/rocksdb/blob/0a2d3b663a962cf86af5ad82c80baf1cd71f7766/include/rocksdb/c.h#L1544-L1547
* `disable_auto_compactions`
https://github.com/facebook/rocksdb/blob/0a2d3b663a962cf86af5ad82c80baf1cd71f7766/include/rocksdb/c.h#L1487-L1490
* `optimize_filters_for_hits`
https://github.com/facebook/rocksdb/blob/0a2d3b663a962cf86af5ad82c80baf1cd71f7766/include/rocksdb/c.h#L1491-L1494

Perhaps I have misunderstood the documentation, and these functions are correct. In which case, could the docs be updated to explain the relationship between an `int` and `unsigned char`? Should the same logic of `if (value == 0) false else true` be used?