[SUGGESTION] Change x86 march flag to "pentium3"

Crypto... I have yet to see a Xonotic server that will encrypt the connection.

Ironic I know but local games do use cryptographic signing including on campaign mode. This means with a slow enough CPU if you try and start the campaign you may get a DDOS warning. It can be fixed by fiddling with cvars but if out of the box a system can't run the campaign mode then clearly it isn't powerful enough. I've only seen this problem on a P3-550 and a Via C3-2 1.2GHz.

My point in same ways here is why not set a hard barrier that the game absolutely won't run below? The dedicated server is a seperate binary so this is really about the game engine itself.

I see someone has voted for keeping i686 MMX so it would be great to hear why.