api_extensions: add seccomp_notify

src/lxc/api_extensions.h

@@ -43,6 +43,7 @@ static char *api_extensions[] = {
 	"cgroup_relative",
 	"mount_injection_file",
 	"seccomp_allow_nesting",
+	"seccomp_notify",
 };
 
 static size_t nr_api_extensions = sizeof(api_extensions) / sizeof(*api_extensions);