vndk-def: Remove NDK extension check

This commit removes NDK extension check.  This check is less
meaningful.  The more meaningful check is to check whether vendor
modules use extended APIs or not.

Test: The warning "NDK library should not be extended" disappears.
Change-Id: If43989b02ee924309d1e16d9d643e346516eeb98
diff --git a/vndk/tools/definition-tool/vndk_definition_tool.py b/vndk/tools/definition-tool/vndk_definition_tool.py
index 28c81b5..ea6edd9 100755
--- a/vndk/tools/definition-tool/vndk_definition_tool.py
+++ b/vndk/tools/definition-tool/vndk_definition_tool.py
@@ -1972,13 +1972,6 @@
                 'warning: {}: This is a framework library with vendor-only '
                 'usages.')
 
-    def _check_ndk_extensions(self, graph, generic_refs):
-        for lib_set in graph.lib_pt:
-            for lib in lib_set.values():
-                if lib.is_ndk and not generic_refs.is_equivalent_lib(lib):
-                    print('warning: {}: NDK library should not be extended.'
-                            .format(lib.path), file=sys.stderr)
-
     @staticmethod
     def _extract_simple_vndk_result(vndk_result):
         field_name_tags = [
@@ -2048,10 +2041,6 @@
     def main(self, args):
         generic_refs, graph, tagged_paths = self.create_from_args(args)
 
-        # Check the API extensions to NDK libraries.
-        if generic_refs:
-            self._check_ndk_extensions(graph, generic_refs)
-
         if args.warn_incorrect_partition:
             self._warn_incorrect_partition(graph)