Pack relocation tables for dynamic executables

  Add replocation-packer step for dynmic executables.

  Enable it by default for arm and arm64 platforms.

Bug: http://b/18051137
Change-Id: I0c88fd31595bcea62a087f219acb9ecf9c80f2e5
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 8bf4c57..6bc3632 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -93,6 +93,7 @@
 LOCAL_FORCE_STATIC_EXECUTABLE:=
 LOCAL_ADDITIONAL_DEPENDENCIES:=
 LOCAL_STRIP_MODULE:=
+LOCAL_PACK_MODULE_RELOCATIONS:=
 LOCAL_JNI_SHARED_LIBRARIES:=
 LOCAL_JNI_SHARED_LIBRARIES_ABI:=
 LOCAL_PREBUILT_JNI_LIBS:=