tests: add utimensat.test

* tests/utimensat.c: New file.
* tests/utimensat.test: New test.
* tests/Makefile.am (check_PROGRAMS): Add utimensat.
(TESTS): Add utimensat.test.
* configure.ac (AC_CHECK_FUNCS): Add utimensat.
* tests/.gitignore: Add utimensat.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e443917..1b078e0 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -64,6 +64,7 @@
 	umovestr2 \
 	unix-pair-send-recv \
 	utime \
+	utimensat \
 	xattr \
 	xet_robust_list \
 	# end of check_PROGRAMS
@@ -135,6 +136,7 @@
 	uid32.test \
 	uio.test \
 	utime.test \
+	utimensat.test \
 	xattr.test \
 	xet_robust_list.test \
 	count.test \