treewide: automatic rewriting of all comment-style type annotations

Performed using https://github.com/ilevkivskyi/com2ann

This has no actual effect on the codebase as type checkers (still)
support both and negligible effect on runtime performance since
__future__ annotations ameliorates that. Technically, the bytecode would
be bigger for non function-local annotations, of which we have many
either way.

So if it doesn't really matter, why do a large-scale refactor? Simple:
because people keep wanting to, but it's getting nickle-and-dimed. If
we're going to do this we might as well do it consistently in one shot,
using tooling that guarantees repeatability and correctness.

Repeat with:

```
com2ann mesonbuild/
```

1 files changed, 1 insertions, 1 deletions

diff --git a/mesonbuild/envconfig.py b/mesonbuild/envconfig.py
index 56dee65..5340521 100644
--- a/mesonbuild/envconfig.py
+++ b/mesonbuild/envconfig.py
@@ -460,7 +460,7 @@ class BinaryTable:
 class CMakeVariables:
     def __init__(self, variables: T.Optional[T.Dict[str, T.Any]] = None) -> None:
         variables = variables or {}
-        self.variables = {}  # type: T.Dict[str, T.List[str]]
+        self.variables: T.Dict[str, T.List[str]] = {}
 
         for key, value in variables.items():
             value = mesonlib.listify(value)