memcached: import from packages, add myself as the maintainer

This adds the memcached package from the old svn package fee. I adopt
the licensing information an will maintain the package in the future.
This request also updates memcached to the last stable version 1.4.20.
Building was testet with target x86_64, ar71xx and avr32

Signed-off-by: Thomas Heil <heil@terminal-consulting.de>

net/memcached/patches/100-fix_iov_max.patch

@@ -0,0 +1,23 @@
+--- a/memcached.c
++++ b/memcached.c
+@@ -13,6 +13,10 @@
+  *      Anatoly Vorobey <mellon@pobox.com>
+  *      Brad Fitzpatrick <brad@danga.com>
+  */
++#ifndef __need_IOV_MAX
++#define __need_IOV_MAX
++#endif
++
+ #include "memcached.h"
+ #include <sys/stat.h>
+ #include <sys/socket.h>
+@@ -29,9 +33,6 @@
+ #define _P1003_1B_VISIBLE
+ #endif
+ /* need this to get IOV_MAX on some platforms. */
+-#ifndef __need_IOV_MAX
+-#define __need_IOV_MAX
+-#endif
+ #include <pwd.h>
+ #include <sys/mman.h>
+ #include <fcntl.h>