hg: panama/dev: Add $ORIGIN to rpath of libjclang.so.

[henry.jen at oracle.com]

Changeset: b6b89e592f06
Author:    henryjen
Date:      2018-11-01 08:14 -0700
URL:       http://hg.openjdk.java.net/panama/dev/rev/b6b89e592f06

Add $ORIGIN to rpath of libjclang.so.
Reviewed-by: mcimadamore

! make/lib/Lib-jdk.internal.clang.gmk