Support to optionally run rmtypedefs.

Bug: 10330586
Change-Id: I6ddfca2ec986cf2c82b0942b7a5360508f095e9a
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 8940c3a..7fea460 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -140,6 +140,7 @@
 LOCAL_POST_INSTALL_CMD:=
 LOCAL_DIST_BUNDLED_BINARIES:=
 LOCAL_HAL_STATIC_LIBRARIES:=
+LOCAL_RMTYPEDEFS:=
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.