Fix the x86_64 clone implementation.

Change-Id: Ia75f46dcb4d3222049e9a6a6fabc2b17223b47f7
diff --git a/tests/Android.mk b/tests/Android.mk
index 5cc2d28..59e5129 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -71,6 +71,7 @@
     netdb_test.cpp \
     pthread_test.cpp \
     regex_test.cpp \
+    sched_test.cpp \
     signal_test.cpp \
     stack_protector_test.cpp \
     stack_unwinding_test.cpp \