linux-headers: bump 3.14.x and 4.{4, 5}.x series

linux-headers: bump 3.14.x and 4.{4, 5}.x series

Kernel headers 4.5 -> 4.5.4 broke netfilter uapi headers leading to
build failures for cases where glibc's net/if.h was included before
linux/if.h
This is fixed since 4.5.5 via linux kernel commit 4a91cb61 and fixes:
http://autobuild.buildroot.net/results/736/7362431f62ebb1b436ac41ea3ef85228c763e6f3/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>