tests: add sched_xetscheduler.test

* tests/sched_xetscheduler.c: New file.
* tests/sched_xetscheduler.test: New test.
* tests/.gitignore: Add sched_xetscheduler.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(TESTS): Add sched_xetscheduler.test.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 59e7e78..2a8b147 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -148,6 +148,7 @@
 	sched_xetaffinity \
 	sched_xetattr \
 	sched_xetparam \
+	sched_xetscheduler \
 	scm_rights \
 	seccomp \
 	select \
@@ -317,6 +318,7 @@
 	sched_xetaffinity.test \
 	sched_xetattr.test \
 	sched_xetparam.test \
+	sched_xetscheduler.test \
 	scm_rights-fd.test \
 	seccomp.test \
 	select.test \