Bump cargo to 865cb70

[pietroalbini]

Merged PRs:

• Replace util::without_prefix with Path::strip_prefix Replace util::without_prefix with Path::strip_prefix cargo#6620
• keep track of crates that are whitelisted to be used even if yanked keep track of crates that are whitelisted to be used even if yanked cargo#6611
• Fix default DYLD_FALLBACK_LIBRARY_PATH on MacOS. Fix default DYLD_FALLBACK_LIBRARY_PATH on MacOS. cargo#6625
• Bail when trying to run "test --doc --no-run" Bail when trying to run "test --doc --no-run" cargo#6628
• In cargo test's help, add that examples are built In cargo test's help, add that examples are built cargo#6619
• Extract & re-use filter_targets in cargo_compile Extract & re-use filter_targets in cargo_compile cargo#6621
• Test cleanup: remove unnecessary with_status(0) Test cleanup: remove unnecessary with_status(0) cargo#6630
• Fix run's help message Fix run's help message cargo#6631
• Some updates to bash completion. Some updates to bash completion. cargo#6644
• Introduce Source::download_now Introduce Source::download_now cargo#6637
• Switch from unused_imports to deprecated to test unfixable warnings Switch from unused_imports to deprecated to test unfixable warnings cargo#6649

[rust-highfive]

r? @nikomatsakis

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[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[Mark-Simulacrum]

@bors r+ p=1 (unblocks other work)

[bors]

📌 Commit 998e584 has been approved by Mark-Simulacrum

[bors]

⌛ Testing commit 998e584 with merge 8f21c8b...

[bors]

💔 Test failed - status-appveyor

[pietroalbini]

@bors retry pls

[bors]

⌛ Testing commit 998e584 with merge 2d72528...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: Mark-Simulacrum
Pushing 2d72528 to master...