tests: add seccomp-strict.test

* tests/seccomp-strict.c: New file.
* tests/seccomp-strict.test: New test.
* tests/.gitignore: Add seccomp-strict.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add seccomp-strict.test.
diff --git a/tests/.gitignore b/tests/.gitignore
index 222255f..12b0c53 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -128,6 +128,7 @@
 sched_xetscheduler
 scm_rights
 seccomp
+seccomp-strict
 select
 sendfile
 sendfile64