tests: add rt_sigqueueinfo.test

* tests/rt_sigqueueinfo.c: New file.
* tests/rt_sigqueueinfo.test: New test.
* tests/Makefile.am (check_PROGRAMS): Add rt_sigqueueinfo.
(TESTS): Add rt_sigqueueinfo.test.
* tests/.gitignore: Add rt_sigqueueinfo.
diff --git a/tests/.gitignore b/tests/.gitignore
index 4e609c0..ef0d573 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -27,6 +27,7 @@
 ppoll
 readlink
 readlinkat
+rt_sigqueueinfo
 sched_xetattr
 scm_rights
 seccomp