Explicitly specify the icu:: namespace.

Bug: 15350832
Change-Id: I8d84f3e50b643806ccf01190797c69ce6445b539
diff --git a/NativeCode.mk b/NativeCode.mk
index 7bdac5a..1449e30 100644
--- a/NativeCode.mk
+++ b/NativeCode.mk
@@ -67,7 +67,7 @@
 core_shared_libraries := $(LOCAL_SHARED_LIBRARIES)
 core_static_libraries := $(LOCAL_STATIC_LIBRARIES)
 core_cflags := $(LOCAL_CFLAGS) -Wall -Wextra -Werror
-core_cppflags += -std=gnu++11
+core_cppflags += -std=gnu++11 -DU_USING_ICU_NAMESPACE=0
 
 core_test_files := \
   luni/src/test/native/dalvik_system_JniTest.cpp \