Kernel prepatch 2.6.26-rc4

I didn't test -rc4 yet, but with -rc2 and -rc3, s2ram was broken for me, and on each s2disk
all my shells are spammed with
kernel: unregister_netdevice: waiting for wlan0 to become free. Usage count = 4
etc.

If it weren't for the improved iwlwifi drivers, I'd stick with 2.6.25 for now.