Remove libdl* tests from bionic-unit-tests-static

Bug: http://b/21900592
Change-Id: I907cc15684b121ec2fbdeca49fc584bb6d2eaacc
(cherry picked from commit de4e27e231143e4e1982b4ca9effd03c1ca12d86)
diff --git a/tests/Android.mk b/tests/Android.mk
index 964a34a..84d3426 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -49,9 +49,6 @@
 test_cppflags = \
     -std=gnu++11 \
 
-libBionicStandardTests_src_files_target := \
-    libdl_test.cpp \
-
 libBionicStandardTests_src_files := \
     arpa_inet_test.cpp \
     buffer_tests.cpp \
@@ -275,6 +272,7 @@
     dlext_test.cpp \
     __cxa_thread_atexit_test.cpp \
     dlfcn_test.cpp \
+    libdl_test.cpp \
     pthread_dlfcn_test.cpp \
 
 bionic-unit-tests_cflags := $(test_cflags)