flip1995 547ce0db27
Change env var used for testing Clippy
This changes the variable used for testing Clippy in the internal test
suite:

```
CLIPPY_TESTS -> __CLIPPY_INTERNAL_TESTS
```

`CLIPPY_TESTS` is understandably used in environments of Clippy users,
so we shouldn't use it in our test suite.
2021-01-07 12:38:10 +01:00
..