dhcpcd: update to 6.1.0

dhcpcd: update to 6.1.0

DHCPv6 and other features
see: http://roy.marples.name/projects/dhcpcd/wiki/DhcpcdHistory

-update download location
-install default dhcpcd hooks script and example hooks

v2:
-add CFLAGS to configure test

configure test failed silently on OMAP because of missing CFLAGS (-mfloat-abi=hard) with
../arm-openwrt-linux-uclibcgnueabi/bin/ld: error: _getifaddrs uses VFP register arguments

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@40726 3c298f89-4303-0410-b956-a3cf2f4a3e73