add trace-libgit feature

[dm9pZCAq]

This Pull Request "fixes" #902.

It changes the following:

• make libgit tracing optional, but enabled by default

I followed the checklist:

• I added unittests
• I ran make check without errors
  • not related to PR
• I tested the overall application
• I added an appropriate item to the changelog

error from make check

error[E0425]: cannot find function `pthread_getname_np` in crate `libc`
    --> /home/v/.cache/cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/pprof-0.5.0/src/profiler.rs:112:30
     |
112  |     let ret = unsafe { libc::pthread_getname_np(current_thread, name_ptr, MAX_THREAD_NAME) };
     |                              ^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `pthread_getattr_np`
     |
    ::: /home/v/.cache/cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/libc-0.2.101/src/unix/linux_like/mod.rs:1508:5
     |
1508 |     pub fn pthread_getattr_np(native: ::pthread_t, attr: *mut ::pthread_attr_t) -> ::c_int;
     |     --------------------------------------------------------------------------------------- similarly named function `pthread_getattr_np` defined here

[extrawurst]

lgtm! can you please update the changelog accordingly and put a note into the readme appropriately?

[dm9pZCAq]

something like this?

[extrawurst]

something like this?

well I don't see you adding a note in the readme, but the changelog looks fine. please also bring it up to date with master

[dm9pZCAq]

please also bring it up to date with master

sorry about this

I don't see you adding a note in the readme

i don't know where and how should i add this in readme

it can fit into Build and Diagnostics 🤔

do you have any suggestions?

[dm9pZCAq]

do you have any suggestions?

no any suggestions? 😢

[extrawurst]

no any suggestions? 😢

I mean why did you need this change? to make gentoo work, right? so I guess its a good point to add as a note there for others in your position

[dm9pZCAq]

something like this?

https://github.com/extrawurst/gitui/blob/6bc5335be1cc62e83444e5526d84ea5b88253c96/README.md#cargo-features

[extrawurst]

yea lets got with that! 👍