Makefile cleanups.

Also add the DEX2OAT_FLAGS to the generation of core.oat/core.art.

Change-Id: I5d113fad460b2e14fc652816069adba29ca744b8
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index ae5b08f..5ca8bec 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -316,7 +316,7 @@
 #    {5: trace or no-trace}-{6: gcstress gcverify cms}-{7: forcecopy checkjni jni}-
 #    {8: no-image image}-{9: test name}{10: 32 or 64}
 define define-test-art-run-test
-  run_test_options := $(addprefix --runtime-option ,$(DALVIKVM_FLAGS))
+  run_test_options :=
   prereq_rule :=
   test_groups :=
   uc_host_or_target :=