Allow globally disabling the relocation packer.

The relocation packer is part of prebuilts/misc, and pulling that
repository into the manifest requires pulling in a lot of other things
not needed by the simpler builds (like the clang toolchain manifest).

Bug: http://b/17441393
Change-Id: If4a94804fc1a3f81215b840247f8e332d0b510c1

core/dynamic_binary.mk

@@ -44,7 +44,10 @@ include $(BUILD_SYSTEM)/binary.mk
 relocation_packer_input := $(linked_module)
 relocation_packer_output := $(intermediates)/PACKED/$(my_built_module_stem)
 
-my_pack_module_relocations := $(LOCAL_PACK_MODULE_RELOCATIONS)
+my_pack_module_relocations := false
+ifneq ($(DISABLE_RELOCATION_PACKER),true)
+    my_pack_module_relocations := $(LOCAL_PACK_MODULE_RELOCATIONS)
+endif
 
 ifeq ($(my_pack_module_relocations),)
   my_pack_module_relocations := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_PACK_MODULE_RELOCATIONS)

core/prebuilt_internal.mk

@@ -48,6 +48,10 @@ ifeq (SHARED_LIBRARIES,$(LOCAL_MODULE_CLASS))
     # Do not pack relocations by default
     LOCAL_PACK_MODULE_RELOCATIONS := false
   endif
+
+  ifeq ($(DISABLE_RELOCATION_PACKER),true)
+    LOCAL_PACK_MODULE_RELOCATIONS := false
+  endif
 endif
 
 ifneq ($(filter STATIC_LIBRARIES SHARED_LIBRARIES,$(LOCAL_MODULE_CLASS)),)