New comment by klardotsh on void-packages repository

https://github.com/void-linux/void-packages/pull/25955#issuecomment-720161826

Comment:
Since 0.3.2 came out today, I went ahead and bumped this PR to target the new version instead. This required a change to `json-c++` to build the multi-header version rather than the single-header version. Based on [the multi-header version's json.hpp](https://github.com/nlohmann/json/blob/develop/include/nlohmann/json.hpp), this should be a backwards-compatible change.

Game still builds and runs on x86_64-musl.