tools include uapi x86: Add __NR_setns, if missing

To help us provide a simple setns() in older distros.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Krister Johansen <kjlx@templeofstupid.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-o10a85kf6j7ig87ep6crab2k@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/arch/x86/include/asm/unistd_32.h

@@ -10,3 +10,6 @@
 #ifndef __NR_getcpu
 # define __NR_getcpu 318
 #endif
+#ifndef __NR_setns
+# define __NR_setns 346
+#endif

tools/arch/x86/include/asm/unistd_64.h

@@ -10,3 +10,6 @@
 #ifndef __NR_getcpu
 # define __NR_getcpu 309
 #endif
+#ifndef __NR_setns
+#define __NR_setns 308
+#endif