Update to 1.7.3.1
Fix SSL builds
Source: http://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/net/socat/patches/#dirlist

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Do not include netinet/if_ether.h for musl to prevent struct ethhdr
redeclarations.

Also define NETDB_INTERNAL if needed to fix compilation of the network
backends.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

The cross-compiling patch is no longer necessary.  Also added librt as a
dependency, since it is required.  This also fixes an issue where
support for linux/errqueue.h was not being detected correctly and
causing a build failure with 3.18.

Signed-off-by: John Szakmeister <john@szakmeister.net>

Signed-off-by: Ted Hess <thess@kitschensync.net>