socat: fix compile erorr against 3.17+ kernel headers

socat: fix compile erorr against 3.17+ kernel headers

With the linux 3.17 kernel socat's configure detects the wrong include
for errqueue.h which results in a compilation error.

By backporting the gentoo patch from:

  http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-misc/socat/files/socat-1.7.2.4-linux-3.17.patch

Fixes the build issue

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>