build: sort listing files

Signed-off-by: Alejandro Mery <amery@geeks.cl>
build.sh: rework updating method

don't remember why it was reimplemented in this way, but somehow the
previous had the tendency of getting out of sync

Signed-off-by: Alejandro Mery <amery@geeks.cl>
build:linux: add experimental/sunxi-3.14 branch

Signed-off-by: Alejandro Mery <amery@geeks.cl>
linux: add multi_v7_defconfig support

Signed-off-by: Alejandro Mery <amery@geeks.cl>