Move away from the __ARCH_WANT_SYSCALL_NO_AT system calls.

Modern architectures only get the *at(2) system calls. For example,
aarch64 doesn't have open(2), and expects userspace to use openat(2)
instead.

Change-Id: I87b4ed79790cb8a80844f5544ac1a13fda26c7b5
diff --git a/tests/Android.mk b/tests/Android.mk
index 59e5129..5bcf996 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -84,6 +84,7 @@
     sys_select_test.cpp \
     sys_sendfile_test.cpp \
     sys_stat_test.cpp \
+    sys_time_test.cpp \
     system_properties_test.cpp \
     time_test.cpp \
     unistd_test.cpp \