Alert if ConfigFS is not supported

[tejado]

Implement a configfs support check, e.g. over the kernel version. It is also possible to check if certain gadgets are available over the kernel (/proc/config.tgz -> CONFIG_USB_F_ flags)

[bgeke]

nethunter USB arsenal (https://www.kali.org/docs/nethunter/nethunter-usbarsenal/) checks configfs. I don't know how it works since I don't have much knowledge on computer languages.

I tried nethunter on Moto G (falcon) and got message that my kernel does not support configFS. someone also reported it in nethunter forums
https://forums.kali.org/showthread.php?49033-Your-kernel-does-not-support-USB-ConfigFS

https://gitlab.com/kalilinux/nethunter/build-scripts/kali-nethunter-project/-/issues/1423. One Plus has nethunter builds and this issue may be different. But it checks configFS.

currently I do not have nethunter but if you want to test anything on Moto G (Falcon) running on kernel 3.4.113, I can follow your instruction.