Auto merge of #77637 - ehuss:update-cargo, r=ehuss
Auto merge of #77637 - ehuss:update-cargo, r=ehuss

Update cargo

3 commits in 75615f8e69f748d7ef0df7bc0b064a9b1f5c78b2..9d1a4863abd9237dbf9d1b74c78632b6a205f6bb
2020-09-29 18:42:19 +0000 to 2020-10-05 18:29:52 +0000
- Add LTO to the metadata filename hash. (rust-lang/cargo#8755)
- Fix dylib+rlib with LTO. (rust-lang/cargo#8754)
- Homepage doc cargo metadata (rust-lang/cargo#8744)

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust