Small changes to get `--cython-compile-all` working again (GH-3650)

Fixes https://github.com/cython/cython/issues/3647

Cython/Build/Dependencies.py

@@ -322,7 +322,8 @@ def strip_string_literals(code, prefix='__Pyx_L'):
     in_quote = False
     hash_mark = single_q = double_q = -1
     code_len = len(code)
-    quote_type = quote_len = None
+    quote_type = None
+    quote_len = -1
 
     while True:
         if hash_mark < q:

Cython/Compiler/ParseTreeTransforms.py

@@ -2877,7 +2877,7 @@ class GilCheck(VisitorTransform):
             self.visitchildren(node, outer_attrs)
 
         self.nogil = gil_state
-        self.visitchildren(node, exclude=outer_attrs)
+        self.visitchildren(node, attrs=None, exclude=outer_attrs)
         self.nogil = was_nogil
 
     def visit_FuncDefNode(self, node):