Support C++11/C++14 within get_global_typedef

libcpychecker was failing to run for GCC 6 on C++ source files, due to
failing to detect the PyObject typedef.

Root cause was that the test for u.language == 'GNU C++' was failing;
lang_hooks.name defaults to 'GNU C++14' for GCC 6.

Author: davidmalcolm

gccutils/__init__.py

@@ -37,7 +37,7 @@ def get_global_typedef(name):
     # Look up a typedef in global scope by name, returning a gcc.TypeDecl,
     # or None if not found
     for u in gcc.get_translation_units():
-        if u.language == 'GNU C++':
+        if u.language.startswith('GNU C++'):
             gns = gcc.get_global_namespace()
             return gns.lookup(name)
         if u.block: