Retire LOCAL_NDK_VERSION.

Bug: 6932421
Change-Id: If9aef724e8323ba0c9b94a6464cf2953b60fdcc3
diff --git a/Android.mk b/Android.mk
index 9fbe6b7..f4943d8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -32,7 +32,6 @@
 LOCAL_MODULE := libbz
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
 ifeq ($(TARGET_ARCH),arm)
-  LOCAL_NDK_VERSION := 5
   LOCAL_SDK_VERSION := 9
 endif
 include $(BUILD_STATIC_LIBRARY)