Retire LOCAL_NDK_VERSION.

Bug: 6932421
Change-Id: I9e5e8fba22ac235701c002e27012bb3954896140
diff --git a/jni/Android.mk b/jni/Android.mk
index 593074f..cc1174b 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -7,12 +7,10 @@
 LOCAL_SRC_FILES := jni_egl_fence.cpp
 
 ifeq ($(TARGET_ARCH), arm)
-        LOCAL_NDK_VERSION := 5
         LOCAL_SDK_VERSION := 9
 endif
 
 ifeq ($(TARGET_ARCH), x86)
-        LOCAL_NDK_VERSION := 6
         LOCAL_SDK_VERSION := 9
 endif