busybox: add patch(es) to support ping using SOCK_DGRAM

patch #1 updates ping to busybox as of 1.22.0
patch #2 fixes the incomplete SOCK_DGRAM (not upstream yet)

https://lkml.org/lkml/2011/5/13/382
http://openwall.info/wiki/people/segoon/ping
http://lists.busybox.net/pipermail/busybox/2014-January/080199.html
http://lists.busybox.net/pipermail/busybox/2014-January/080206.html

in order to activate the support, one has to modify
/proc/sys/net/ipv4/ping_group_range
(it takes 2 group ids, and any group within the range is allowed access.
for example 0 2000 -> all uids from0 to 2000 are allowed to use it)

this will be added to rc.local in the next commit.

closes #155
addresses #117
rc.local: default to give users ping permissions
remove no longer needed ping-perms package
busybox: don't build ping as standalone applet anymore

since we dont need to give the binary any special privileges anymore,
it's no longer needed to split it off.

closes #99
butch template: special case musl so it doesnt get removed

otherwise dynamically linked coreutils (if someone prefered it over
busybox) will no longer work anymore as soon as musl starts getting
rebuilt, so the musl build will fail as cp, mv, ln, etc are no
longer available.

closes #163
stage1: remove extlinux because the definition of stage1 has changed from "a system that boots" to "a basic system that can build most stuffs"
initramfs.init: mount /boot with 700 perms, umount /proc and /sys before calling newroot/init
  mount boot with umask: since /boot now uses vfat, this security feature is needed
  umount /sys and /proc: this removes the need to modify rc.boot in write-hd-image-squash
use the new prereqs infrastructure for service scripts, install services from their own packages. Add an sshd service that runs the openssh service if it exists, otherwise it runs dropbear.
write-hd-image-squash.sh: use the new prereqs infrastructure to setup rootfs before creating the squashfs
mdev.conf: rename the uucp group to serial
/etc/(passwd|group): remove unneeded groups and users
wpa-supplicant: add a service file and default config
iw: remove unneeded CFLAGS from the libnl-tiny patch