[package] keepalived: fix compile

newer kernels (3.7) split user side headers

should fix: #12875

Should the patch be compatible with older kernels too?
(see https://dev.openwrt.org/ticket/12875#comment:6 )

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>


git-svn-id: svn://svn.openwrt.org/openwrt/packages@38841 3c298f89-4303-0410-b956-a3cf2f4a3e73