Remove stale order-only dependency from build-art-*-tests targets.

TEST_ART_RUN_TEST_ORDERONLY_DEPENDENCIES isn't set anymore. It was
removed in https://r.android.com/370727.

#codehealth

Test: art/tools/buildbot-build.sh
Change-Id: I34bf11bb451010e330cfad092c7b7d867dd055d6
diff --git a/Android.mk b/Android.mk
index 5bddf57..0b456c9 100644
--- a/Android.mk
+++ b/Android.mk
@@ -739,10 +739,10 @@
 # Rules for building all dependencies for tests.
 
 .PHONY: build-art-host-tests
-build-art-host-tests:   build-art-host $(TEST_ART_RUN_TEST_DEPENDENCIES) $(ART_TEST_HOST_RUN_TEST_DEPENDENCIES) $(ART_TEST_HOST_GTEST_DEPENDENCIES) | $(TEST_ART_RUN_TEST_ORDERONLY_DEPENDENCIES)
+build-art-host-tests:   build-art-host $(TEST_ART_RUN_TEST_DEPENDENCIES) $(ART_TEST_HOST_RUN_TEST_DEPENDENCIES) $(ART_TEST_HOST_GTEST_DEPENDENCIES)
 
 .PHONY: build-art-target-tests
-build-art-target-tests:   build-art-target $(TEST_ART_RUN_TEST_DEPENDENCIES) $(ART_TEST_TARGET_RUN_TEST_DEPENDENCIES) $(ART_TEST_TARGET_GTEST_DEPENDENCIES) | $(TEST_ART_RUN_TEST_ORDERONLY_DEPENDENCIES)
+build-art-target-tests:   build-art-target $(TEST_ART_RUN_TEST_DEPENDENCIES) $(ART_TEST_TARGET_RUN_TEST_DEPENDENCIES) $(ART_TEST_TARGET_GTEST_DEPENDENCIES)
 
 ########################################################################
 # targets to switch back and forth from libdvm to libart