unix: add seccomp mode constants

Add the SECCOMP_MODE_DISABLED, SECCOMP_MODE_STRICT and
SECCOMP_MODE_FILTER constants to be used with the PR_SET_SECCOMP prctl.
See http://man7.org/linux/man-pages/man2/prctl.2.html

Change-Id: Iacd1ffaeced4ae95e780a09038d35b763778a3d3
Reviewed-on: https://go-review.googlesource.com/46691
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/unix/zerrors_linux_mipsle.go b/unix/zerrors_linux_mipsle.go
index b3978c5..9430745 100644
--- a/unix/zerrors_linux_mipsle.go
+++ b/unix/zerrors_linux_mipsle.go
@@ -1395,6 +1395,9 @@
 	SCM_TIMESTAMPING_OPT_STATS           = 0x36
 	SCM_TIMESTAMPNS                      = 0x23
 	SCM_WIFI_STATUS                      = 0x29
+	SECCOMP_MODE_DISABLED                = 0x0
+	SECCOMP_MODE_FILTER                  = 0x2
+	SECCOMP_MODE_STRICT                  = 0x1
 	SHUT_RD                              = 0x0
 	SHUT_RDWR                            = 0x2
 	SHUT_WR                              = 0x1