[IA64] Wire up getrandom() system call

See commit c6e9d6f38894798696f23c8084ca7edbf16ee895
    random: introduce getrandom(2) system call

for all the details (and even a manual page!)

Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/include/uapi/asm/unistd.h b/arch/ia64/include/uapi/asm/unistd.h
index 7de0a2d..99801c3 100644
--- a/arch/ia64/include/uapi/asm/unistd.h
+++ b/arch/ia64/include/uapi/asm/unistd.h
@@ -328,5 +328,6 @@
 #define __NR_sched_setattr		1336
 #define __NR_sched_getattr		1337
 #define __NR_renameat2			1338
+#define __NR_getrandom			1339
 
 #endif /* _UAPI_ASM_IA64_UNISTD_H */