Retire LOCAL_NDK_VERSION.

Bug: 6932421
Change-Id: I4be6c58355635735ca26c7dcbc7f14d08e5c4319
diff --git a/Android.mk b/Android.mk
index e02b488..3780c89 100644
--- a/Android.mk
+++ b/Android.mk
@@ -27,7 +27,6 @@
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
 LOCAL_SRC_FILES := $(zlib_files)
 ifeq ($(TARGET_ARCH),arm)
-  LOCAL_NDK_VERSION := 5
   LOCAL_SDK_VERSION := 9
 endif
 include $(BUILD_SHARED_LIBRARY)
@@ -40,7 +39,6 @@
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
 LOCAL_SRC_FILES := $(zlib_files)
 ifeq ($(TARGET_ARCH),arm)
-  LOCAL_NDK_VERSION := 5
   LOCAL_SDK_VERSION := 9
 endif
 include $(BUILD_STATIC_LIBRARY)
@@ -84,7 +82,6 @@
 LOCAL_MODULE:= libunz
 LOCAL_ARM_MODE := arm
 ifeq ($(TARGET_ARCH),arm)
-  LOCAL_NDK_VERSION := 5
   LOCAL_SDK_VERSION := 9
 endif
 include $(BUILD_STATIC_LIBRARY)