Don't set connection to established if packet is kill packet.

Removed now useless defines in network.h
Fixed bug where two Tox clients sometimes didn't reconnect right
after disconnecting due to them getting stuck in a connection loop.
Merge branch 'master' of https://github.com/mannol1/toxcore
Fixed warning.
Use epoll_create() instead of epoll_create1() for compatibility with
older kernels.
Fixed --disable-epoll making configure fail.
fix mannol
fix warnings
Merge branch 'split-video' of https://github.com/notsecure/toxcore into notsecure-split-video
dark forces were very active, so to say...