Switch bootstrap to 1.41

[Mark-Simulacrum]

This updates the version number for master to 1.42 and switches the bootstrap compiler to yesterday's beta. Fallout of cfg(bootstrap) changes is also dealt with.

[alexcrichton]

@bors: r+ p=1

[bors]

📌 Commit 8218444 has been approved by alexcrichton

[bors]

🌲 The tree is currently closed for pull requests below priority 100, this pull request will be tested once the tree is reopened

[rust-highfive]

The job mingw-check of your PR failed (pretty log, 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.

2019-12-18T17:22:17.0393797Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-12-18T17:22:17.0625096Z ##[command]git config gc.auto 0
2019-12-18T17:22:17.0691707Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-12-18T17:22:17.0751934Z ##[command]git config --get-all http.proxy
2019-12-18T17:22:17.0909329Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/67402/merge:refs/remotes/pull/67402/merge
---
2019-12-18T17:33:12.4334702Z configure: build.locked-deps    := True
2019-12-18T17:33:12.4334750Z configure: llvm.ccache          := sccache
2019-12-18T17:33:12.4334955Z configure: build.cargo-native-static := True
2019-12-18T17:33:12.4335176Z configure: dist.missing-tools   := True
2019-12-18T17:33:12.4335612Z configure: build.configure-args := ['--enable-sccache', '--disable-manage-submodu ...
2019-12-18T17:33:12.4335734Z configure: writing `config.toml` in current directory
2019-12-18T17:33:12.4335783Z configure: 
2019-12-18T17:33:12.4336038Z configure: run `python /checkout/x.py --help`
2019-12-18T17:33:12.4336090Z configure: 
---
2019-12-18T17:42:12.6375955Z   local time: Wed Dec 18 17:42:12 UTC 2019
2019-12-18T17:42:12.7873900Z   network time: Wed, 18 Dec 2019 17:42:12 GMT
2019-12-18T17:42:12.7877490Z == end clock drift check ==
2019-12-18T17:42:14.2555208Z 
2019-12-18T17:42:14.2663769Z ##[error]Bash exited with code '1'.
2019-12-18T17:42:14.2705622Z ##[section]Starting: Checkout
2019-12-18T17:42:14.2708141Z ==============================================================================
2019-12-18T17:42:14.2708201Z Task         : Get sources
2019-12-18T17:42:14.2708250Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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)

[Mark-Simulacrum]

@bors r=alexcrichton

[bors]

📌 Commit 241d2e7 has been approved by alexcrichton

[bors]

🌲 The tree is currently closed for pull requests below priority 100, this pull request will be tested once the tree is reopened

[mark-i-m]

If I am not mistaken, it appears the tree was closed here: #66932 and has been forgotten that way? Nothing appears to be running CI at the moment.

[Mark-Simulacrum]

@bors p=100

I thought we had a rollup going but I might've missed its end

[bors]

⌛ Testing commit 241d2e7 with merge c605199...

[bors]

☀️ Test successful - checks-azure
Approved by: alexcrichton
Pushing c605199 to master...