cindex.py: remove obsolete workaround and FIXME

clang_getCursorSpelling() doesn't assert on non-declarations any more and the
behaviour is covered by c-index tests.

Passes nosetests.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211482 91177308-0d34-0410-b5e6-96231b3b80d8

bindings/python/clang/cindex.py

@@ -1166,10 +1166,6 @@ class Cursor(Structure):
     @property
     def spelling(self):
         """Return the spelling of the entity pointed at by the cursor."""
-        if not self.kind.is_declaration():
-            # FIXME: clang_getCursorSpelling should be fixed to not assert on
-            # this, for consistency with clang_getCursorUSR.
-            return None
         if not hasattr(self, '_spelling'):
             self._spelling = conf.lib.clang_getCursorSpelling(self)