Fix link-type warning on GLJNI

An sdk app GLJNI uses a native:platform library libgljni, which causes a
link-type warning. Actually libutils is the only platform library used
by libgljni, and the warning can be eliminated by rewriting code not to
use libutils and setting LOCAL_SDK_VERSION.

Bug: 73907534
Test: mma -j does not show any link-type warnings
Change-Id: Ia7e02c343f4b18c70be15f6b1c9462ee4bdca733