Add support for loading of encrypted libraries

Author: sjanusz-r7

lib/rex/post/meterpreter/client_core.rb

@@ -258,7 +258,8 @@ def load_library(opts)
       end
 
       if library_image
-        request.add_tlv(TLV_TYPE_DATA, library_image, false, client.capabilities[:zlib])
+        decrypted_library_image = ::MetasploitPayloads.decrypt_payload(payload: library_image)
+        request.add_tlv(TLV_TYPE_DATA, decrypted_library_image, false, client.capabilities[:zlib])
       else
         raise RuntimeError, "Failed to serialize library #{library_path}.", caller
       end