pylint: enable use-sequence-for-iteration

This found a couple of places where we *don't* want to use set(), and
want to use list() instead.

.pylintrc

@@ -88,7 +88,6 @@ disable=
     use-dict-literal,
     use-implicit-booleaness-not-comparison,
     use-list-literal,
-    use-sequence-for-iteration,
     used-before-assignment,
     useless-return,
     useless-super-delegation,

mesonbuild/build.py

@@ -1002,7 +1002,7 @@ class BuildTarget(Target):
         return missing_languages
 
     def validate_sources(self):
-        if len(self.compilers) > 1 and any(lang in self.compilers for lang in {'cs', 'java'}):
+        if len(self.compilers) > 1 and any(lang in self.compilers for lang in ['cs', 'java']):
             langs = ', '.join(self.compilers.keys())
             raise InvalidArguments(f'Cannot mix those languages into a target: {langs}')
 

mesonbuild/interpreter/interpreter.py

@@ -2475,7 +2475,7 @@ class Interpreter(InterpreterBase, HoldableObject):
     )
     def func_configure_file(self, node: mparser.BaseNode, args: T.List[TYPE_var],
                             kwargs: kwtypes.ConfigureFile):
-        actions = sorted(x for x in {'configuration', 'command', 'copy'}
+        actions = sorted(x for x in ['configuration', 'command', 'copy']
                          if kwargs[x] not in [None, False])
         num_actions = len(actions)
         if num_actions == 0: