tests: add prctl-seccomp-strict.test

* tests/prctl-seccomp-strict.c: New file.
* tests/prctl-seccomp-strict.test: New test.
* tests/.gitignore: Add prctl-seccomp-strict.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add prctl-seccomp-strict.test.
diff --git a/tests/.gitignore b/tests/.gitignore
index e9dc19b..222255f 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -100,6 +100,7 @@
 pipe
 poll
 ppoll
+prctl-seccomp-strict
 pread64-pwrite64
 preadv
 preadv-pwritev