Apply version script to libcamera2ndk platform lib

Bug: http://b/69603741
Test: make
Change-Id: I436140508c7cc1d7d9fa3ff24662865ad52be086
diff --git a/camera/ndk/Android.mk b/camera/ndk/Android.mk
index f5ff69d..53addf1 100644
--- a/camera/ndk/Android.mk
+++ b/camera/ndk/Android.mk
@@ -39,6 +39,8 @@
 LOCAL_CFLAGS += -fvisibility=hidden -D EXPORT='__attribute__ ((visibility ("default")))'
 LOCAL_CFLAGS += -Wall -Wextra -Werror
 
+LOCAL_LDFLAGS += -Wl,--version-script=$(LOCAL_PATH)/libcamera2ndk.map.txt
+
 LOCAL_SHARED_LIBRARIES := \
     libbinder \
     liblog \