Auto merge of rust-lang#6763 - flip1995:fix_lintcheck, r=matthiaskrgr

Fix lintcheck by excluding checked crates from workspace

r? `@matthiaskrgr`  cc `@camsteffen`

So `exclude` doesn't work with glob patterns, but it turns out that it works with `starts_with`.

changelog: none

Cargo.toml

@@ -19,7 +19,7 @@ edition = "2018"
 publish = false
 
 [workspace]
-exclude = ["clippy_dev", "mini-macro"]
+exclude = ["clippy_dev", "mini-macro", "target/lintcheck/crates"]
 
 [[bin]]
 name = "cargo-clippy"