/usr/lib/jni/librxtxRaw.so is in librxtx-java 2.2pre2+dfsg1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/jni/librxtxRaw-2.2pre1.so
/usr/lib/jni/librxtxRaw-2.2pre1.so