Add LOCAL_GROUP_STATIC_LIBRARIES

Set LOCAL_GROUP_STATIC_LIBRARIES := true to group the static libraries,
in case we need gcc flags "-Wl,--start-group" and "-Wl,--end-group" to
fix circular references.

Change-Id: I03c4901670112fcdd2bb0fe660b6924e5776fcf8
diff --git a/core/binary.mk b/core/binary.mk
index f81cc5e..53534d6 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -137,6 +137,12 @@
 endif
 endif
 
+ifeq (true,$(LOCAL_GROUP_STATIC_LIBRARIES))
+$(LOCAL_BUILT_MODULE): PRIVATE_GROUP_STATIC_LIBRARIES := true
+else
+$(LOCAL_BUILT_MODULE): PRIVATE_GROUP_STATIC_LIBRARIES :=
+endif
+
 ###########################################################
 ## Define arm-vs-thumb-mode flags.
 ###########################################################