Remove use of compiled proxy stub from portable.

ARM implementation is tested, but x86 and MIPS are not.

Change-Id: I497d650c55fe7fd4ea24d283c8d8ee99b1456610
diff --git a/src/runtime_support.h b/src/runtime_support.h
index 1c6c38c..89026c1 100644
--- a/src/runtime_support.h
+++ b/src/runtime_support.h
@@ -31,6 +31,7 @@
 #include "thread.h"
 
 extern "C" void art_interpreter_invoke_handler();
+extern "C" void art_portable_proxy_invoke_handler();
 extern "C" void art_quick_proxy_invoke_handler();
 extern "C" void art_work_around_app_jni_bugs();