sandbox/seccomp: wire extra syscall

These values are only useful for libseccomp.

Signed-off-by: Ophestra <cat@gensokyo.uk>

sandbox/seccomp/syscall_extra_linux_amd64.go

@@ -0,0 +1,16 @@
+package seccomp
+
+/*
+#cgo linux pkg-config: --static libseccomp
+
+#include <seccomp.h>
+*/
+import "C"
+
+var syscallNumExtra = map[string]int{
+	"umount": SYS_UMOUNT,
+}
+
+const (
+	SYS_UMOUNT = C.__PNR_umount
+)