make it possible to override the disclaimer

Author: antocuni

hpy/tools/autogen/autogenfile.py

@@ -1,4 +1,4 @@
-DISCLAIMER = """
+C_DISCLAIMER = """
 /*
    DO NOT EDIT THIS FILE!
 
@@ -7,22 +7,25 @@
        make autogen
 
 */
-
 """
 
 class AutoGenFile:
     LANGUAGE = 'C'
     PATH = None
+    DISCLAIMER = None
 
     def __init__(self, api):
+        if self.DISCLAIMER is None and self.LANGUAGE == 'C':
+            self.DISCLAIMER = C_DISCLAIMER
         self.api = api
 
     def generate(self):
         raise NotImplementedError
 
     def write(self, root):
         with root.join(self.PATH).open('w') as f:
-            if self.LANGUAGE == 'C':
-                f.write(DISCLAIMER)
+            if self.DISCLAIMER is not None:
+                f.write(self.DISCLAIMER)
+                f.write('\n')
             f.write(self.generate())
             f.write('\n')