odhcp6c: avoid busylooping with strangely behaving dhcpv6 servers

Thanks to Dave Taht for debugging and thanks to Comcast for
shipping strangely behaving software so I can fix some corner cases.

Signed-off-by: Steven Barth <steven@midlink.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43415 3c298f89-4303-0410-b956-a3cf2f4a3e73
scripts/config.sub: add back musl support that was accidentally dropped in r43353

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43417 3c298f89-4303-0410-b956-a3cf2f4a3e73
devel: import perf from oldpackages

perf was in the oldpackages repository, but it makes more sense to have
it part of the default package set since we build it from the Linux
kernel sources.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43418 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: 3.18: Fix patch 644 dependency chain

This patch introduces some code that is compiled in whenever
CONFIG_BRIDGE_NETFILTER is built, with the code called from code compiled under
CONFIG_BRIDGE, CONFIG_BRIDGE_IGMP_SNOOPING or CONFIG_BRIDGE_NF_EBTABLES.

Unfortunately, these options aren't setting explicitly the dependency they now
have on CONFIG_BRIDGE_NETFILTER, for obvious reasons for CONFIG_BRIDGE.

However, this is not working really well when CONFIG_BRIDGE_NETFILTER is built
as a module, since code statically compiled will now use a function that is not
in the kernel image, which makes the linker grumpy.

Solve this by removing the option to build CONFIG_BRIDGE_NETFILTER as a module,
and protect our function definition by an IS_BUILTIN instead of a IS_ENABLED
macro. This fixes the issue for CONFIG_BRIDGE and CONFIG_BRIDGE_IGMP_SNOOPING.

Fixing CONFIG_BRIDGE_NF_EBTABLES has to be handled a bit differently, since it
directly references a variable that will not be declared if
CONFIG_BRIDGE_NETFILTER is not set. Protect the variable affectations by an
ifdef to make sure this doesn't happen.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43419 3c298f89-4303-0410-b956-a3cf2f4a3e73