[libclang] python: fix return type of clang_Type_getSizeOf().

Patch by Loïc Jaquemet!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191346 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/bindings/python/clang/cindex.py b/bindings/python/clang/cindex.py
index f3e230e..fc32394 100644
--- a/bindings/python/clang/cindex.py
+++ b/bindings/python/clang/cindex.py
@@ -3128,7 +3128,7 @@
 
   ("clang_Type_getSizeOf",
    [Type],
-   c_ulonglong),
+   c_longlong),
 ]
 
 class LibclangError(Exception):