Support to optionally run rmtypedefs.

Bug: 10330586
Change-Id: I6ddfca2ec986cf2c82b0942b7a5360508f095e9a
diff --git a/core/config.mk b/core/config.mk
index 96993c0..4e461a7 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -332,6 +332,7 @@
 DEXOPT := $(HOST_OUT_EXECUTABLES)/dexopt$(HOST_EXECUTABLE_SUFFIX)
 DEXPREOPT := dalvik/tools/dex-preopt
 LINT := prebuilts/sdk/tools/lint
+RMTYPEDEFS := $(HOST_OUT_EXECUTABLES)/rmtypedefs
 
 # ACP is always for the build OS, not for the host OS
 ACP := $(BUILD_OUT_EXECUTABLES)/acp$(BUILD_EXECUTABLE_SUFFIX)