Add LOCAL_SDK_VERSION in flatbuffers-java

The flatbuffers-java is using only public API. However it is defined
java:platform which can use internal API, since it is not defined
LOCAL_SDK_VERSION.
So, LOCAL_SDK_VERSION := current is added in flatbuffers-java,
because it can be turn into errors when link type check becomes
more strict.

Bug: 69899800
Test: mma -j under flatbuffers-java dir
Change-Id: I6a015beb0edec2f42d898bfba30dcea99e39417d
1 file changed