extensions.py: do away with a few more globals

src/extensions.py

@@ -70,9 +70,8 @@ class Module(object):
                 names[key] = entries[key]
         return names
 
-modules = []
 xproto = None
-def parseFile(filename):
+def parseFile(filename, modules):
     global xproto
     mod = Module(filename)
     if mod.is_ext:
@@ -113,8 +112,9 @@ def emit_module(module, output):
 def main():
     # Parse the xml file
     output_file = sys.argv[1]
+    modules = []
     for input_file in sys.argv[2:]:
-        parseFile(input_file)
+        parseFile(input_file, modules)
 
     assert xproto != None