This patch adds missing architecture-specific headers for use with eventfd(2). Fixes #16679. Signed-off-by: Luis Dallos <ld@nkvd.ignorelist.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42916 3c298f89-4303-0410-b956-a3cf2f4a3e73