cmake: removed legacy kwargs from interpreter dict

mesonbuild/interpreter.py

@@ -2028,7 +2028,7 @@ permitted_kwargs = {'add_global_arguments': {'language', 'native'},
                     'both_libraries': known_library_kwargs,
                     'library': known_library_kwargs,
                     'subdir': {'if_found'},
-                    'subproject': {'version', 'default_options', 'required', 'method', 'cmake_options'},
+                    'subproject': {'version', 'default_options', 'required'},
                     'test': {'args', 'depends', 'env', 'is_parallel', 'should_fail', 'timeout', 'workdir',
                              'suite', 'protocol'},
                     'vcs_tag': {'input', 'output', 'fallback', 'command', 'replace_string'},