Add an Auto option to live_compile

[jvoisin]

As suggested by @zeroSteiner

[smcintyre-r7]

It looks like the #live_compile? method needs to be updated to check if the COMPILER option is Auto or one of the explicit options.

Right now, I'm getting this exception and the compiler isn't selected.

msf6 exploit(linux/local/af_packet_chocobo_root_priv_esc) > run

[*] Started reverse TCP handler on 192.168.250.134:4444 
[!] AutoCheck is disabled, proceeding with exploitation
[-] Exploit aborted due to failure: bad-config: Auto is not installed. Set COMPILE False to upload a pre-compiled executable.
[*] Exploit completed, but no session was created.
msf6 exploit(linux/local/af_packet_chocobo_root_priv_esc) > 

[cdelafuente-r7]

Release Notes

This adds an Auto option to the Msf::Post::Linux::Compile library. This enables automatic selection of the compiler according to what is available locally on the target system.