config: add test showing error in Config::from_str() usage

[DanielEScherzer]

No description provided.

[DanielEScherzer]

@rustbot label +bug "help wanted"
This was intended to show that the code from #1225 has some problem somewhere - I spent a few hours trying to debug it and came up empty, some uses of the config work fine and others result in tcache_thread_shutdown(): unaligned tcache chunk detected
@ehuss should #1225 be reverted for now?

[ehuss]

Yea, let's go ahead and revert. Looking more closely, git_config_backend_from_string is part of the "sys" API which I do not believe is intended to be part of the public API.

I think I see what's causing the memory corruption, so I'll file an issue with libgit2. But since it is an internal API, we probably shouldn't be exposing it here.

[rustbot]

☔ The latest upstream changes (possibly #1227) made this pull request unmergeable. Please resolve the merge conflicts.

[DanielEScherzer]

I think I see what's causing the memory corruption, so I'll file an issue with libgit2

Would appreciate a link to that, I wasn't able to figure out the cause

[ehuss]

Here's the upstream issue: libgit2/libgit2#7219

[DanielEScherzer]

@rustbot label "-help wanted" -S-waiting-on-review +S-blocked +upstream

Lets wait until the upstream issue is resolved, and then I'll investigate trying to re-add the ::from_str() method

[rustbot]

Error: Parsing relabel command in comment failed: ...' label -' | error: quote in word at >| '"help want'...

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