tests: add faccessat.test

* tests/faccessat.c: New file.
* tests/faccessat.test: New test.
* tests/.gitignore: Add faccessat.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add faccessat.test.
diff --git a/tests/.gitignore b/tests/.gitignore
index 2159761..ba3b8f5 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -30,6 +30,7 @@
 execve-v
 execveat
 execveat-v
+faccessat
 fanotify_mark
 fchmod
 fcntl