build(python): simplify rpycdec vendor layout

third_party/python/rpycdec/src/renpy/astsupport.py

@@ -0,0 +1,32 @@
+class PyExpr(str):
+
+    expr: str
+    filename: str
+    linenumber: int
+    py: int
+    hashcode: str
+    column: int
+
+    def __new__(
+        cls,
+        expr: str,
+        filename: str = '',
+        linenumber: int = 0,
+        py: int = 3,
+        hashcode: str = '',
+        column: int = 0,
+    ):
+        self = super().__new__(cls, expr)
+        self.expr = expr
+        self.filename = filename
+        self.linenumber = linenumber
+        self.py = py
+        self.hashcode = hashcode
+        self.column = column
+        return self
+
+    def get_code(self, **kwargs) -> str:
+        return self.expr
+
+    def __str__(self):
+        return self.expr