fix the repr for OrderedSet to actually execute correctly

Old:
```
OrderedSet("'foo'", "'bar'", "'baz'")
```

New:
```
OrderedSet(['foo', 'bar', 'baz'])
```

The old one looked nasty *and* was totally non-functional.

mesonbuild/utils/universal.py

@@ -1886,8 +1886,8 @@ def __len__(self) -> int:
     def __repr__(self) -> str:
         # Don't print 'OrderedSet("")' for an empty set.
         if self.__container:
-            return 'OrderedSet("{}")'.format(
-                '", "'.join(repr(e) for e in self.__container.keys()))
+            return 'OrderedSet([{}])'.format(
+                ', '.join(repr(e) for e in self.__container.keys()))
         return 'OrderedSet()'
 
     def __reversed__(self) -> T.Iterator[_T]: