add SIOCGSTAMPNS socket ioctl macro to ioctl.h

it is defined in linux asm/sockios.h since commit
ae40eb1ef30ab4120bd3c8b7e3da99ee53d27a23 (linux v2.6.22)
but was missing from musl by accident.

in musl the sockios macros are exposed in sys/ioctl.h together
with other ioctl requests instead of in sys/socket.h because of
namespace rules. (glibc has them in sys/socket.h under _GNU_SOURCE.)

arch/generic/bits/ioctl.h

@@ -137,6 +137,7 @@ struct winsize {
 #define SIOCGPGRP       0x8904
 #define SIOCATMARK      0x8905
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/mips/bits/ioctl.h

@@ -145,6 +145,7 @@ struct winsize {
 #define SIOCSPGRP       _IOW('s', 8, pid_t)
 #define SIOCGPGRP       _IOR('s', 9, pid_t)
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/mips64/bits/ioctl.h

@@ -145,6 +145,7 @@ struct winsize {
 #define SIOCSPGRP       _IOW('s', 8, pid_t)
 #define SIOCGPGRP       _IOR('s', 9, pid_t)
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/mipsn32/bits/ioctl.h

@@ -145,6 +145,7 @@ struct winsize {
 #define SIOCSPGRP       _IOW('s', 8, pid_t)
 #define SIOCGPGRP       _IOR('s', 9, pid_t)
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/powerpc/bits/ioctl.h

@@ -150,6 +150,7 @@ struct winsize {
 #define SIOCGPGRP       0x8904
 #define SIOCATMARK      0x8905
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/powerpc64/bits/ioctl.h

@@ -150,6 +150,7 @@ struct winsize {
 #define SIOCGPGRP       0x8904
 #define SIOCATMARK      0x8905
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/s390x/bits/ioctl.h

@@ -131,6 +131,7 @@ struct winsize {
 #define SIOCGPGRP       0x8904
 #define SIOCATMARK      0x8905
 #define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C

arch/sh/bits/ioctl.h

@@ -141,6 +141,7 @@ struct winsize {
 #define SIOCSPGRP       _IOW('s', 8, int)
 #define SIOCGPGRP       _IOW('s', 9, int)
 #define SIOCGSTAMP      _IOR('s', 100, char[8])
+#define SIOCGSTAMPNS    _IOR('s', 101, char[8])
 
 #define SIOCADDRT       0x890B
 #define SIOCDELRT       0x890C