kernel: do not accept sysrq characters via serial port

many boards have a disconnected TTL level serial which can generate
some garbage that can lead to spurious false sysrq detects.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37210 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: debloat the lzma compress/decompress code some more

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37211 3c298f89-4303-0410-b956-a3cf2f4a3e73
tools: add a package for findutils, Linux 3.10 need GNU xargs

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37212 3c298f89-4303-0410-b956-a3cf2f4a3e73
scripts/download.pl: use HTTP instead of FTP for the default GNU site

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37213 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: add linux 3.10

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37214 3c298f89-4303-0410-b956-a3cf2f4a3e73