TypeError: load_configuration.has GUARD_RF_FLAGS.INSTRUMENTED

[Wenzel]

Describe the bug
Testing whether GUARD_RF_FLAGS.INSTRUMENTED is present with the has method on a load_configuration object returns a TypeError

To Reproduce

• load a PE with LIEF
• run b.load_configuration.has(GUARD_RF_FLAGS.INSTRUMENTED)

Expected behavior
The method should have returned a boolean to indicate whether this flag was present or not.

Environment (please complete the following information):

• System and Version : Ubuntu 20.04
• Target format PE
• LIEF commit version: 0.10.1-bfe5414

Additional context
I need this feature to check RFG support:
Wenzel/checksec.py#77

Thanks !

[romainthomas]

In progress on the branch issue/473