memcached: re-add patch that was removed for no reason

[ci skip]

srcpkgs/memcached/patches/termios.patch

@@ -0,0 +1,12 @@
+linux_priv.c:82:90: error: invalid application of 'sizeof' to incomplete type 'struct termios'
+   82 |     rc |= seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(ioctl), 1, SCMP_A1(SCMP_CMP_EQ, TCGETS));
+
+--- linux_priv.c
++++ linux_priv.c
+@@ -1,5 +1,6 @@
+ #include "config.h"
+ #include <seccomp.h>
++#include <termios.h>
+ #include <errno.h>
+ #include <stdlib.h>
+ #include <sys/ioctl.h>