patch fstools to work with current overlayfs
add mtd utils from oldpackages and update to the current version so it works with MLC
update host mtd-utils to 1.5.1

to make ubinize work with big (2MiB) eraseblocks
...while disabling mkfs.ubifs and probably breaking lots of other builds
in the process
enable building of an ubinized squashfs image for cubietruck
make sysupgrade work on sunxi, while breaking it for everything that expects the older overlayfs.
lacking all kinds of tests.
uboot-envtools: make envtools work with mlc flash
remove unnecessary remains of copy'n'paste
unbreak nfsv4 kernel module build
remove patch that breaks build of newer mtd-utils needed for mlfc support
enable (broken) 3.18 build for sunxi
Merge branch 'sunxi-mtd' of https://github.com/quitte/openwrt into sunxi-mtd

undoes kernel and u-boot modifications in preparation for the same thing with newer versions