Update rls

[nrc]

And expose the CFG_VERSION env var to tools so they can determine the version of Rust.

This gets the RLS back on master and so completes the PR dance for the generators PR.

r? @alexcrichton

[alexcrichton]

@bors: r+

[bors]

📌 Commit 464091c has been approved by alexcrichton

[Mark-Simulacrum]

I'm confused: This is exposing CFG_VERSION to tools, but I don't see it being used by RLS (based on the diff in this PR, at least). I'm fine with that being the case, but seem rather strange.

[alexcrichton]

I believe the plan is to eventually use CFG_VERSION to affect the CLI-reported version of the rls. We're trying to move towards a model where the version reported from all CLI tools is the same (just different git revs)

[nrc]

@bors: r=alexcrichton (bumped RLS again)

[bors]

📌 Commit 5eb478a has been approved by alexcrichton

[bors]

⌛ Testing commit 5eb478a with merge 4889a1501b30fe4b3b5a82b64b9b130136c39b36...

[bors]

💔 Test failed - status-travis

[kennytm]

@bors retry #44221 or #40474

check i686-apple-darwin failed to download LLVM archive.

[00:02:39] Attempting with retry: sh -c rm -f d9e7d2696e41983b6b5a0b4fac604b4e548a84d3.tar.gz &&             curl -sSL -O https://github.com/rust-lang/llvm/archive/d9e7d2696e41983b6b5a0b4fac604b4e548a84d3.tar.gz
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

[bors]

⌛ Testing commit 5eb478a with merge 5e9431a...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing 5e9431a to master...