Upgrade rand to 0.7

[mati865]

Also upgrades getrandom to avoid bug encountered by #61393 which bumps libc to 0.2.62.

[rust-highfive]

r? @nikomatsakis

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[RalfJung]

If I am reading this PR correctly, recent getrandom only support Linux 2.6.22+. That would be a problem as Rust supports 2.6.18+.

[mati865]

It was later decided to add support for older kernels to be on pair with Rust: rust-random/getrandom#58 (comment)
See commit rust-random/getrandom@6a45c49

I'll update this PR once tests pass.

[gnzlbg]

The license of the wasi crate is not Apache2/MIT but Apache2 with LLVM exception. That's compatible with the Rust run-time, so this LGTM.

I've opened an issue with them to try to relicense it also under MIT as well, but that can be done later - and if it for whatever reason it cannot be done, then that's not critical either.

[gnzlbg]

@alexcrichton could you review this? I'm not a reviewer for rust-lang/rust

[alexcrichton]

@bors: r+

[bors]

📌 Commit 74b3548 has been approved by alexcrichton

[bors]

⌛ Testing commit 74b3548 with merge 391cdd3bd50db0e942a08a8d731a02fe879b76ea...

[rust-highfive]

The job x86_64-gnu-distcheck of your PR failed (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2019-08-28T17:27:00.8972807Z do so (now or later) by using -b with the checkout command again. Example:
2019-08-28T17:27:00.8972888Z 
2019-08-28T17:27:00.8973167Z   git checkout -b <new-branch-name>
2019-08-28T17:27:00.8973216Z 
2019-08-28T17:27:00.8973557Z HEAD is now at 391cdd3bd Auto merge of #63806 - mati865:rand, r=alexcrichton
2019-08-28T17:27:00.9139924Z ##[section]Starting: Collect CPU-usage statistics in the background
2019-08-28T17:27:00.9143569Z ==============================================================================
2019-08-28T17:27:00.9143689Z Task         : Bash
2019-08-28T17:27:00.9143770Z Description  : Run a Bash script on macOS, Linux, or Windows
---
2019-08-28T17:42:13.7799358Z tidy check
2019-08-28T17:42:14.6630958Z * 578 error codes
2019-08-28T17:42:14.6631151Z * highest error code: E0733
2019-08-28T17:42:15.0349128Z * 263 features
2019-08-28T17:42:15.4257543Z invalid license Apache-2.0 WITH LLVM-exception in /checkout/obj/build/tmp/distcheck/src/../vendor/wasi/Cargo.toml
2019-08-28T17:42:15.7661427Z some tidy checks failed
2019-08-28T17:42:15.7662684Z 
2019-08-28T17:42:15.7662684Z 
2019-08-28T17:42:15.7663988Z command did not execute successfully: "/checkout/obj/build/tmp/distcheck/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/obj/build/tmp/distcheck/src" "/checkout/obj/build/tmp/distcheck/build/x86_64-unknown-linux-gnu/stage0/bin/cargo"
2019-08-28T17:42:15.7664236Z 
2019-08-28T17:42:15.7664272Z 
2019-08-28T17:42:15.7674569Z failed to run: /checkout/obj/build/tmp/distcheck/build/bootstrap/debug/bootstrap test
2019-08-28T17:42:15.7674757Z Build completed unsuccessfully in 0:03:23
2019-08-28T17:42:15.7674757Z Build completed unsuccessfully in 0:03:23
2019-08-28T17:42:15.7728504Z Makefile:48: recipe for target 'check' failed
2019-08-28T17:42:15.7728648Z 
2019-08-28T17:42:15.7728726Z command did not execute successfully: "make" "check"
2019-08-28T17:42:15.7728822Z expected success, got: exit code: 2
2019-08-28T17:42:15.7728868Z 
2019-08-28T17:42:15.7728868Z 
2019-08-28T17:42:15.7728905Z 
2019-08-28T17:42:15.7729005Z make: *** [check] Error 1
2019-08-28T17:42:15.7779619Z Build completed unsuccessfully in 0:10:30
2019-08-28T17:42:15.7784932Z == clock drift check ==
2019-08-28T17:42:15.7810885Z   local time: Wed Aug 28 17:42:15 UTC 2019
2019-08-28T17:42:15.8541012Z   network time: Wed, 28 Aug 2019 17:42:15 GMT
2019-08-28T17:42:15.8541012Z   network time: Wed, 28 Aug 2019 17:42:15 GMT
2019-08-28T17:42:15.8544290Z == end clock drift check ==
2019-08-28T17:42:17.7103026Z ##[error]Bash exited with code '1'.
2019-08-28T17:42:17.7145258Z ##[section]Starting: Upload CPU usage statistics
2019-08-28T17:42:17.7152383Z ==============================================================================
2019-08-28T17:42:17.7152484Z Task         : Bash
2019-08-28T17:42:17.7152578Z Description  : Run a Bash script on macOS, Linux, or Windows

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[bors]

💔 Test failed - checks-azure

[mati865]

Ready to go.

@rustbot modify labels: -S-blocked +S-waiting-on-review

[alexcrichton]

@bors: r+

[bors]

📌 Commit 32101ad has been approved by alexcrichton

[bors]

⌛ Testing commit 32101ad with merge 2b58d1cff23a1ead45c0f0180996e26c3c2da14d...

[bors]

💥 Test timed out

[mati865]

Kindly asking the the retry (msvc was too slow again...).

[alexcrichton]

@bors: retry