Statically link openssl for reqwest

[illicitonion]

Avoids platform-specific library location issues.

[cosmicexplorer]

illicitonion/reqwest@983409e for anyone curious

[wisechengyi]

What does the change mean?

native-tls-vendored = ["native-tls/vendored"]

[illicitonion]

What does the change mean?

native-tls-vendored = ["native-tls/vendored"]

Crates can have optional features (in the [features] section of their Cargo.toml), which may both entail optional dependencies, and optional pieces of code: https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section

Our dependency chain here goes engine -> reqwest -> native-tls.

native-tls exposes a feature called vendored which will statically link openssl.
We want to enable that.
But you can't enable features on transitive deps, only on direct deps.
So my change to reqwest adds a feature to reqwest called native-tls-vendored which enables the vendored feature on its native-tls dependency.
Then my change here enables the native-tls-vendored feature on our reqwest dependency, which will in turn enable the vendored feature of its native-tls dependency, leading to openssl being statically linked :)

[stuhood]

Thanks.

[stuhood]

Although the travis failure seems to be deterministic (https://travis-ci.org/pantsbuild/pants/jobs/460355339), I don't repro it locally. Will rebase this to master and give it another go.

[stuhood]

https://stackoverflow.com/a/41497735 ... ?

[stuhood]

Pushed a commit to "try harder" with regard to ulimit setting on that shard.

[wisechengyi]

Breaking out the targets seems to do the trick.

@cosmicexplorer would you mind consolidating python_native_code_testing_(1-3) into more 1:1:1 compliant in a follow patch? so there would be no need for things like

python_tests(
  sources=globs('test_*.py', exclude=([globs('*_integration.py')] + python_native_code_test_files)),

Also I did not spend the time trimming unused dependencies for python_native_code_testing_(1-3)