build: Fix golem build to exclude libartd.so from public.libraries.txt

Golem doesn't build libartd.so, so at runtime the JNI loading would fail
when trying to initialize the android library namespaces.

Test: build-art-target-golem
Bug: 31401609
Change-Id: I2ee988e84d0a87b3cd1338d29fc28a874905cccc
1 file changed