linux-atm: Include linux/sockios.h for SIOCGSTAMP

Since linux kernel commit 0768e17073dc527ccd18ed5f96ce85f9985e9115
(2019-04-19) the asm-generic/sockios.h header no longer defines
SIOCGSTAMP. Instead it provides only SIOCGSTAMP_OLD.

The linux/sockios.h header now defines SIOCGSTAMP using either
SIOCGSTAMP_OLD or SIOCGSTAMP_NEW as appropriate. This linux only
header file is not included so we get a build failure.

Signed-off-by: Norbert van Bolhuis <nvbolhuis@aimvalley.nl>

package/network/utils/linux-atm/patches/800-include_sockios.patch

@@ -0,0 +1,21 @@
+--- a/src/maint/saaldump.c	2020-03-29 22:58:01.089711789 +0200
++++ b/src/maint/saaldump.c	2020-03-29 22:59:17.564639387 +0200
+@@ -6,6 +6,7 @@
+ #include <config.h>
+ #endif
+
++#include <linux/sockios.h>
+ #include <stdlib.h>
+ #include <stdarg.h>
+ #include <stdio.h>
+--- a/src/maint/atmdump.c	2020-03-29 22:58:18.573694469 +0200
++++ b/src/maint/atmdump.c	2020-03-29 22:58:49.956729365 +0200
+@@ -6,6 +6,7 @@
+ #include <config.h>
+ #endif
+
++#include <linux/sockios.h>
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <unistd.h>
+