Deadlock in the directory tests

[alexcrichton]

I reproduced this locally and it appears to be because libgit2 and rust-openssl are both initializing OpenSSL at the same time. That is, OpenSSL has weird locking support that makes it kinda hard to use as a hidden dependencies, and now it's being hard about using it as a hidden dependency :(

@sfackler do you have thoughts on this? The libgit2 library is trying to initialize OpenSSL locking I think, although I may be able to figure out how to disable that. Before that, though, are there various options on the rust-openssl side of things?

[sfackler]

openssl-sys provides an init function that handles initialization behind a Once. If you can figure out how to tell libgit2 to stop doing its thing, you should be able to call init and the right things will hopefully happen.

[sfackler]

We could also provide a function to tell openssl-sys to assume OpenSSL has already been initialized if necessary.

[alexcrichton]

Ok, perfect, thanks! I'll funnel everything into using that function.