Support arch-specific LOCAL_C_INCLUDES.

Bug: 11654773
Change-Id: I89c7ce7ff8bea15cb81f9cd9b0188b54beed3422
diff --git a/core/binary.mk b/core/binary.mk
index 3582ba0..4dad51a 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -94,7 +94,7 @@
 my_asflags := $(LOCAL_ASFLAGS) $(LOCAL_ASFLAGS_$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
 my_cc := $(LOCAL_CC)
 my_cxx := $(LOCAL_CXX)
-my_c_includes := $(LOCAL_C_INCLUDES)
+my_c_includes := $(LOCAL_C_INCLUDES) $(LOCAL_C_INCLUDES_$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
 my_generated_sources := $(LOCAL_GENERATED_SOURCES)