Auto merge of #25114 - CYBAI:fix-no-clippy, r=SimonSapin

Update to rustc 1.41.0-nightly (6d77e45f0 2019-12-04)

This PR is similar to #24749. After #25075 merged, I can't build successfully in my local due to no clippy in that nightly version.

```
→ ./mach build -d
info: syncing channel updates for 'nightly-2019-12-04-x86_64-apple-darwin'
info: latest update on 2019-12-04, rust version 1.41.0-nightly (7afe6d9d1 2019-12-03)
error: component 'clippy' for target 'x86_64-apple-darwin' is unavailable for download for channel nightly-2019-12-04
Build FAILED in 0:00:00
```

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)
- [x] These changes do not require tests because just updated rustc version.

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rust-toolchain

@@ -1 +1 @@
-nightly-2019-12-04
+nightly-2019-12-05