hg: panama/dev: Remove dead code

[henry.jen at oracle.com]

Changeset: 91fde25138cd
Author:    henryjen
Date:      2018-11-01 10:31 -0700
URL:       http://hg.openjdk.java.net/panama/dev/rev/91fde25138cd

Remove dead code

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