Add missing test for atexit test suite.

Change-Id: I3d14d7df1da53ccef534c106633593551ab6a7cb
diff --git a/tests/Android.mk b/tests/Android.mk
index 3aef5bb..a5ec45d 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -225,7 +225,7 @@
 include $(LOCAL_PATH)/Android.build.mk
 
 # -----------------------------------------------------------------------------
-# This library used by atexit tests
+# Library used by atexit tests
 # -----------------------------------------------------------------------------
 
 libtest_atexit_src_files := \
@@ -248,6 +248,9 @@
     dlext_test.cpp \
     dlfcn_test.cpp \
 
+bionic-unit-tests_cppflags := \
+    $(test_cppflags)
+
 bionic-unit-tests_ldflags := \
     -Wl,--export-dynamic \
     -Wl,-u,DlSymTestFunction \
@@ -304,6 +307,9 @@
 bionic-unit-tests-glibc_ldlibs := \
     -lrt -ldl \
 
+bionic-unit-tests-glibc_cppflags := \
+    $(test_cppflags)
+
 module := bionic-unit-tests-glibc
 module_tag := optional
 build_type := host