hg: loom/loom: Fix build issue with tests using native libs

[alan.bateman at oracle.com]

Changeset: f0ade44ef451
Author:    alanb
Date:      2019-08-08 10:30 +0100
URL:       https://hg.openjdk.java.net/loom/loom/rev/f0ade44ef451

Fix build issue with tests using native libs

! test/hotspot/jtreg/serviceability/jvmti/FiberTest/libFiberTest.c