Fix pthread_getcpuclockid.

clock_gettime was returning EINVAL for the values
produced by pthread_getcpuclockid.

Bug: 10346183
Change-Id: Iabe643d7d46110bb311a0367aa0fc737f653208e
diff --git a/tests/Android.mk b/tests/Android.mk
index 177e452..902bf69 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -157,7 +157,7 @@
 LOCAL_MODULE := bionic-unit-tests-glibc
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 LOCAL_CFLAGS += $(test_c_flags)
-LOCAL_LDFLAGS += -lpthread -ldl
+LOCAL_LDFLAGS += -lpthread -ldl -lrt
 LOCAL_LDFLAGS += $(test_dynamic_ldflags)
 LOCAL_SRC_FILES := $(test_src_files) $(test_dynamic_src_files)
 LOCAL_STATIC_LIBRARIES += bionic-unit-tests-unwind-test-impl-host